Implement feature to reduce contentless lobby messages
Implement feature to reduce contentless lobby messages

Specifically, a lobby chat message must contain either two distinct
numbers or two distinct letters, or it will be dropped by the server.

QuiteQuiet/Pokemon-Showdown,AWailOfATail/Pokemon-Showdown,MayukhKundu/Flame-Savior,Pokemon-Devs/Pokemon-Showdown,SerperiorBae/BaeShowdown,DB898/theregalias,KaitoV4X/Showdown,urkerab/Pokemon-Showdown,ankailou/Pokemon-Showdown,Mystifi/Exiled,TheManwithskills/New-boiler-test,MasterFloat/LQP-Server-Showdown,Hopenub/Pokemon-Showdown,Irraquated/Pokemon-Showdown,ZeroParadox/ugh,AnaRitaTorres/Pokemon-Showdown,PauLucario/LQP-Server-Showdown,yashagl/yash-showdown,KaitoV4X/Showdown,Kill-The-Noise/BlakJack-Boilerplate,MeliodasBH/Articuno-Land,gustavo515/batata,SSJGVegito007/Vegito-s-Server,Alpha-Devs/OmegaRuby-Server,jumbowhales/Pokemon-Showdown,sama2/Universe-Pokemon-Showdown,Alpha-Devs/Alpha-Server,PrimalGallade45/Dropp-Pokemon-Showdown,KewlStatics/Pokeindia-Codes,SkyeTheFemaleSylveon/Mudkip-Server,psnsVGC/Wish-Server,Flareninja/Pokemon-Showdown-1,abulechu/Lumen-Pokemon-Showdown,hayleysworld/asdfasdf,HoeenCoder/SpacialGaze,ScottehMax/Pokemon-Showdown,lFernanl/Zero-Pokemon-Showdown,Kill-The-Noise/BlakJack-Boilerplate,anubhabsen/Pokemon-Showdown,Alpha-Devs/Alpha-Server,lAlejandro22/lolipoop,PS-Spectral/Spectral,Ransei1/Alt,LegendBorned/PS-Boilerplate,Ridukuo/Test,Flareninja/Pokemon-Showdown,superman8900/Pokemon-Showdown,Atwar/ServerClassroom,CreaturePhil/Showdown-Boilerplate,svivian/Pokemon-Showdown,aakashrajput/Pokemon-Showdown,SerperiorBae/Pokemon-Showdown-1,HoeenCoder/SpacialGaze,Volcos/SpacialGaze,Lord-Haji/SpacialGaze,Psyientist/Showdown-Boilerplate,kupochu/Pokemon-Showdown,asdfghjklohhnhn/Pokemon-Showdown,cadaeic/Pokemon-Showdown,SilverTactic/Pokemon-Showdown,scotchkorean27/Pokemon-Showdown,lFernanl/Pokemon-Showdown,TheManwithskills/Dusk--Showdown,Gold-Solox/Pokemon-Showdown,zczd/enculer,Sora-League/Sora,CrestfallPS/Pokemon-Showdown,Sora-Server/Sora,SerperiorBae/Pokemon-Showdown-1,Volcos/SpacialGaze,RustServer/Pokemon-Showdown,MayukhKundu/Technogear,Darkshadow6/PokeMoon-Creation,sama2/Viridian-Pokemon-Showdown,LustyAsh/EOS-Master,svivian/Pokemon-Showdown,Elveman/RPCShowdownServer,Atwar/http-server-femalehq.rhcloud.com-80.psim.us-,TbirdClanWish/Pokemon-Showdown,Oiawesome/DPPtServ2,MasterFloat/LQP-Server-Showdown,Extradeath/advanced,sama2/Dropp-Pokemon-Showdown,xCrystal/Pokemon-Showdown,DalleTest/Pokemon-Showdown,ZeroParadox/ugh,hayleysworld/Pokemon-Showdown,hayleysworld/Showdown-Boilerplate,Enigami/Pokemon-Showdown,svivian/Pokemon-Showdown,hayleysworld/serenityserver,ehk12/clone,ZestOfLife/PSserver,SilverTactic/Showdown-Boilerplate,Firestatics/Firestatics46,panpawn/Pokemon-Showdown,MayukhKundu/Technogear-Final,Zipzapadam/Server,comedianchameleon/test,Luobata/Pokemon-Showdown,Sora-Server/Sora,Pikachuun/Pokemon-Showdown-SMCMDM,TheManwithskills/Server---Thermal,ZeroParadox/BlastBurners,KewlStatics/Shit,CreaturePhil/Pokemon-Showdown,kubetz/Pokemon-Showdown,hayleysworld/serenity,MayukhKundu/Pokemon-Domain,sama2/Dropp-Pokemon-Showdown,abulechu/Dropp-Pokemon-Showdown,hayleysworld/serenityc9,Pablo000/aaa,CharizardtheFireMage/Showdown-Boilerplate,Disaster-Area/Pokemon-Showdown,hayleysworld/asdfasdf,azum4roll/Pokemon-Showdown,SerperiorBae/Pokemon-Showdown-1,javi501/Lumen-Pokemon-Showdown,Git-Worm/City-PS,superman8900/Pokemon-Showdown,danpantry/Pokemon-Showdown,abrulochp/Dropp-Pokemon-Showdown,CreaturePhil/Showdown-Boilerplate,Kenny-/Pokemon-Showdown,EienSeiryuu/Pokemon-Showdown,lFernanl/Zero-Pokemon-Showdown,Lauc1an/Perulink-Showdown,EmmaKitty/Pokemon-Showdown,azum4roll/Pokemon-Showdown,anubhabsen/Pokemon-Showdown,CreaturePhil/Showdown-Boilerplate,Legendaryhades/Oblivion,DesoGit/Tsunami_PS,TheManwithskills/Server,SerperiorBae/Bae-Showdown,abulechu/Lumen-Pokemon-Showdown,Oiawesome/DPPtServ2,Nineage/Origin,Pokemon-Devs/Pokemon-Showdown,Darkshadow6/git-remote-add-scalingo-git-scalingo.com-pokemoonforums,catanatron/pokemon-rebalance,SerperiorBae/Bae-Showdown,kuroscafe/Paradox,KewlStatics/Showdown-Template,xCrystal/Pokemon-Showdown,Firestatics/Omega-Alpha,Kevinxzllz/PS-Openshift-Server,LightningStormServer/Lightning-Storm,megaslowbro1/Pokemon-Showdown-Server-for-megaslowbro1,xfix/Pokemon-Showdown,gustavo515/test,MeliodasBH/boarhat,Git-Worm/City-PS,lFernanl/Lumen-Pokemon-Showdown,PS-Spectral/Spectral,AustinXII/Pokemon-Showdown,hayleysworld/harmonia,AbsolitoSweep/Absol-server,SerperiorBae/BaeShowdown,PrimalGallade45/Lumen-Pokemon-Showdown,Elveman/RPCShowdownServer,TheFenderStory/Showdown-Boilerplate,KewlStatics/Pokeindia-Codes,InvalidDN/Pokemon-Showdown,psnsVGC/Wish-Server,TheFenderStory/Pokemon-Showdown,LegendBorned/PS-Boilerplate,sama2/Lumen-Pokemon-Showdown,Syurra/Pokemon-Showdown,SilverTactic/Pokemon-Showdown,FakeSloth/Infinite,Ecuacion/Pokemon-Showdown,Tesarand/Pokemon-Showdown,Bryan-0/Pokemon-Showdown,MayukhKundu/Flame-Savior,CharizardtheFireMage/Showdown-Boilerplate,DesoGit/Tsunami_PS,JellalTheMage/Jellals-Server,JellalTheMage/PS-,yashagl/pokecommunity,SolarisFox/Pokemon-Showdown,aakashrajput/Pokemon-Showdown,zek7rom/SpacialGaze,panpawn/Gold-Server,TheDiabolicGift/Showdown-Boilerplate,MeliodasBH/boarhat,RustServer/Pokemon-Showdown,ehk12/clone,Disaster-Area/Pokemon-Showdown,comedianchameleon/test,AWailOfATail/awoat,kuroscafe/Showdown-Boilerplate,JellalTheMage/Jellals-Server,Atwar/ServerClassroom,Pikachuun/Pokemon-Showdown-SMCMDM,SilverTactic/Showdown-Boilerplate,Pikachuun/Joimmon-Showdown,zczd/enculer,Guernouille/Pokemon-Showdown,TheManwithskills/Creature-phil-boiler,Lord-Haji/SpacialGaze,AWailOfATail/awoat,Enigami/Pokemon-Showdown,ZestOfLife/FestiveLife,Legit99/Lightning-Storm-Server,gustavo515/test,TheManwithskills/Dusk--Showdown,cadaeic/Pokemon-Showdown,Parukia/Pokemon-Showdown,iFaZe/SilverZ,kotarou3/Krister-Pokemon-Showdown,xfix/Pokemon-Showdown,SubZeroo99/Pokemon-Showdown,AustinXII/Pokemon-Showdown,Syurra/Pokemon-Showdown,Firestatics/omega,megaslowbro1/Showdown-Server-again,TheFenderStory/Pokemon-Showdown,MasterFloat/Pokemon-Showdown,Zarel/Pokemon-Showdown,InvalidDN/Pokemon-Showdown,forbiddennightmare/Pokemon-Showdown-1,urkerab/Pokemon-Showdown,FakeSloth/Infinite,BasedGod7/PH,Mystifi/Exiled,SkyeTheFemaleSylveon/Mudkip-Server,yashagl/pokecommunity,panpawn/Gold-Server,arkanox/MistShowdown,SerperiorBae/Pokemon-Showdown,Bryan-0/Pokemon-Showdown,SerperiorBae/PokemonShowdown2,Breakfastqueen/advanced,BuzzyOG/Pokemon-Showdown,Hidden-Mia/Roleplay-PS,DarkSuicune/Kakuja-2.0,JennyPRO/Jenny,Tesarand/Pokemon-Showdown,SerperiorBae/Pokemon-Showdown,DB898/theregalias,KewlStatics/Showdown-Template,ShowdownHelper/Saffron,Wando94/Spite,Sora-League/Sora,BuzzyOG/Pokemon-Showdown,Pablo000/aaa,theodelhay/test,Pikachuun/Pokemon-Showdown,Kokonoe-san/Glacia-PS,xCrystal/Pokemon-Showdown,TheManwithskills/DS,ZeroParadox/BlastBurners,Flareninja/Sora,Arcticblast/Pokemon-Showdown,ZestOfLife/FestiveLife,Zarel/Pokemon-Showdown,forbiddennightmare/Pokemon-Showdown-1,ehk12/bigbangtempclone,jd4564/Pokemon-Showdown,UniversalMan12/Universe-Server,SkyeTheFemaleSylveon/Pokemon-Showdown,Ridukuo/Test2,sama2/Universe-Pokemon-Showdown,Wando94/Pokemon-Showdown,lFernanl/Mudkip-Server,yashagl/pokemon-showdown,ankailou/Pokemon-Showdown,ehk12/coregit,Breakfastqueen/advanced,SerperiorBae/Bae-Showdown,lFernanl/Pokemon-Showdown,SerperiorBae/Bae-Showdown-2,Nineage/Showdown-Boilerplate,jd4564/Pokemon-Showdown,Adithya4Uberz/The-Tsunami-League,megaslowbro1/Pokemon-Showdown,DalleTest/Pokemon-Showdown,abulechu/Dropp-Pokemon-Showdown,lAlejandro22/lolipoop,BadSteel/Omega-Pokemon-Showdown,johtooo/PS,gustavo515/final,TbirdClanWish/Pokemon-Showdown,comedianchameleon/servertest1,LightningStormServer/Lightning-Storm,TheDiabolicGift/Lumen-Pokemon-Showdown,AvinashSwaminathan/lotus-v2,Lauc1an/Perulink-Showdown,CorruptedHelix/Pokemon-Showdown,SkyeTheFemaleSylveon/Pokemon-Showdown,Adithya4Uberz/The-Tsunami-League,Atwar/server-epilogueleague.rhcloud.com,BlazingAura/Showdown-Boilerplate,Enigami/Pokemon-Showdown,Firestatics/omega,Celecitia/Plux-Pokemon-Showdown,Vacate/Pokemon-Showdown,johtooo/PS,ehk12/bigbangtempclone,PauLucario/LQP-Server-Showdown,DesoGit/TsunamiPS,Wando94/Spite,asdfghjklohhnhn/Pokemon-Showdown,lFernanl/Mudkip-Server,hayleysworld/serenityserver,TheManwithskills/Server-2,urkerab/Pokemon-Showdown,lFernanl/Lumen-Pokemon-Showdown,hayleysworld/Pokemon-Showdown,SubZeroo99/Pokemon-Showdown,Mystifi/Exiled,sirDonovan/Pokemon-Showdown,BuzzyOG/Pokemon-Showdown,SilverTactic/Dragotica-Pokemon-Showdown,KewlStatics/Shit,Gold-Solox/Pokemon-Showdown,iFaZe/SliverX,sirDonovan/Pokemon-Showdown,sama2/Lumen-Pokemon-Showdown,FakeSloth/wulu,k3naan/Pokemon-Showdown,Stroke123/POKEMON,Flareninja/Hispano-Pokemon-Showdown,TheManwithskills/serenity,Neosweiss/Pokemon-Showdown,Darkshadow6/PokeMoon-Creation,abrulochp/Dropp-Pokemon-Showdown,MayukhKundu/Mudkip-Server,Atwar/server-epilogueleague.rhcloud.com,Thiediev/Pokemon-Showdown,UniversalMan12/Universe-Server,scotchkorean27/Pokemon-Showdown,TheManwithskills/Server,Flareninja/Sora,kuroscafe/Showdown-Boilerplate,AvinashSwaminathan/lotus-v3,Chespin14/Custom-Platform-Pokemon-Showdown,KewlStatics/Alliance,Firestatics/Firestatics46,megaslowbro1/Pokemon-Showdown-Server-for-megaslowbro1,Sora-Server/Sora,TheManwithskills/DS,MayukhKundu/Pokemon-Domain,Flareninja/Showdown-Boilerplate,AvinashSwaminathan/lotus,theodelhay/test,Raina4uberz/Light-server,TheManwithskills/serenity,Flareninja/Pokemon-Showdown,Extradeath/psserver,hayleysworld/serenityc9,Articuno-I/Pokemon-Showdown,Darkshadow6/git-remote-add-scalingo-git-scalingo.com-pokemoonforums,SerperiorBae/BaeShowdown,Irraquated/Showdown-Boilerplate,PS-Spectral/Spectral,ehk12/coregit,TheManwithskills/Server-2,comedianchameleon/servertest1,TheManwithskills/Server---Thermal,jumbowhales/Pokemon-Showdown,catanatron/pokemon-rebalance,Flareninja/Showdown-Boilerplate,Parukia/Pokemon-Showdown,svivian/Pokemon-Showdown,TheDiabolicGift/Lumen-Pokemon-Showdown,SerperiorBae/Pokemon-Showdown,Yggdrasil-League/Yggdrasil,Ecuacion/Lumen-Pokemon-Showdown,MeliodasBH/Articuno-Land,LightningStormServer/Lightning-Storm,Irraquated/EOS-Master,Atwar/http-server-femalehq.rhcloud.com-80.psim.us-,Ridukuo/Test,Firestatics/Omega-Alpha,Articuno-I/Pokemon-Showdown,LustyAsh/EOS-Master,Kevinxzllz/PS-Openshift-Server,Irraquated/Pokemon-Showdown,Evil-kun/Pokemon-Showdown,kupochu/Pokemon-Showdown,Hidden-Mia/Roleplay-PS,Pikachuun/Joimmon-Showdown,EienSeiryuu/Pokemon-Showdown,kubetz/Pokemon-Showdown,sirDonovan/Pokemon-Showdown,Evil-kun/Pokemon-Showdown,TogeSR/Lumen-Pokemon-Showdown,Flareninja/Lumen-Pokemon-Showdown,PrimalGallade45/Dropp-Pokemon-Showdown,QuiteQuiet/Pokemon-Showdown,Adithya4Uberz/KTN,Nineage/Origin,Stroke123/POKEMON,Neosweiss/Pokemon-Showdown,hayleysworld/Showdown-Boilerplate,k3naan/Pokemon-Showdown,Wando94/Pokemon-Showdown,SerperiorBae/Bae-Showdown-2,Lord-Haji/SpacialGaze,bai2/Dropp,Tesarand/Pokemon-Showdown,gustavo515/gashoro,ZestOfLife/PSserver,TheDiabolicGift/Showdown-Boilerplate,SerperiorBae/Bae-Showdown-2,HoeenCoder/SpacialGaze,yashagl/yash-showdown,Legit99/Lightning-Storm-Server,SilverTactic/Dragotica-Pokemon-Showdown,DesoGit/Tsunami_PS,arkanox/MistShowdown,TheManwithskills/Creature-phil-boiler,piiiikachuuu/Pokemon-Showdown,Extradeath/advanced,TheManwithskills/New-boiler-test,abrulochp/Lumen-Pokemon-Showdown,Flareninja/Pokemon-Showdown-1,Pikachuun/Pokemon-Showdown,AWailOfATail/Pokemon-Showdown,NoahVSGamingYT/Pokemon-Showdown,xfix/Pokemon-Showdown,SolarisFox/Pokemon-Showdown,NoahVSGamingYT/Pokemon-Showdown,DarkSuicune/Pokemon-Showdown,miahjennatills/Pokemon-Showdown,Zipzapadam/Server,brettjbush/Pokemon-Showdown,jumbowhales/Pokemon-Showdown,HoeenKid/Pokemon-Showdown-Johto,Yggdrasil-League/Yggdrasil,hayleysworld/harmonia,megaslowbro1/Pokemon-Showdown,Irraquated/Pokemon-Showdown,aakashrajput/Pokemon-Showdown,Flareninja/Lumen-Pokemon-Showdown,Johto-Serverr/Werfin-Boilerplate,kuroscafe/Paradox,xfix/Pokemon-Showdown,BlakJack/Kill-The-Noise,MayukhKundu/Technogear-Final,sama2/Viridian-Pokemon-Showdown,CreaturePhil/Pokemon-Showdown,gustavo515/gashoro,Zarel/Pokemon-Showdown,Pikachuun/Touhoumon-Showdown,PrimalGallade45/Lumen-Pokemon-Showdown,Irraquated/Showdown-Boilerplate,Ridukuo/Test2,Enigami/Pokemon-Showdown,megaslowbro1/Showdown-Server-again,Werfin96/Ultimate,MasterFloat/Pokemon-Showdown,panpawn/Gold-Server,Fusxfaranto/Pokemon-Showdown,yashagl/pokemon,JellalTheMage/PS-,Psyientist/Showdown-Boilerplate,Darkshadow6/PokeMoon-Creation,Parukia/Pokemon-Showdown,DarkSuicune/Pokemon-Showdown,gustavo515/final,Darkshadow6/git-remote-add-scalingo-git-scalingo.com-pokemoonforums,MayukhKundu/Technogear,DarkSuicune/Kakuja-2.0,svivian/Pokemon-Showdown,piiiikachuuu/Pokemon-Showdown,Raina4uberz/Light-server,miahjennatills/Pokemon-Showdown,Kokonoe-san/Glacia-PS,zek7rom/SpacialGaze,DesoGit/TsunamiPS,kotarou3/Krister-Pokemon-Showdown,abrulochp/Lumen-Pokemon-Showdown,AvinashSwaminathan/Pokelegends,yashagl/pokemon,TheManwithskills/Server-2,ShowdownHelper/Saffron,AnaRitaTorres/Pokemon-Showdown,AbsolitoSweep/Absol-server,Sora-League/Sora,Vacate/Pokemon-Showdown,panpawn/Pokemon-Showdown,ShowdownHelper/Saffron,JennyPRO/Jenny,Celecitia/Plux-Pokemon-Showdown,QuiteQuiet/Pokemon-Showdown,BadSteel/Pokemon-Showdown,MayukhKundu/Mudkip-Server,HoeenCoder/SpacialGaze,TheFenderStory/Showdown-Boilerplate,UniversalMan12/Universe-Server,Flareninja/Hispano-Pokemon-Showdown,Alpha-Devs/OmegaRuby-Server,ScottehMax/Pokemon-Showdown,TheManwithskills/COC,Irraquated/EOS-Master,Guernouille/Pokemon-Showdown,TogeSR/Lumen-Pokemon-Showdown,Kill-The-Noise/BlakJack-Boilerplate,EmmaKitty/Pokemon-Showdown,Checkinator/Pokemon-Showdown,BlazingAura/Showdown-Boilerplate,gustavo515/batata,Breakfastqueen/advanced,TheManwithskills/COC,SSJGVegito007/Vegito-s-Server,comedianchameleon/test,danpantry/Pokemon-Showdown,Ecuacion/Pokemon-Showdown,bai2/Dropp,SerperiorBae/PokemonShowdown2,AWailOfATail/Pokemon-Showdown,Ecuacion/Lumen-Pokemon-Showdown,CorruptedHelix/Pokemon-Showdown,brettjbush/Pokemon-Showdown,VoltStorm/Server-pokemon-showdown,Flareninja/Sora,Ransei1/Alt,Checkinator/Pokemon-Showdown,javi501/Lumen-Pokemon-Showdown,xfix/Pokemon-Showdown,AustinXII/Pokemon-Showdown,Extradeath/psserver,KewlStatics/Alliance,hayleysworld/serenity,yashagl/pokemon-showdown