Drop support for Context#originalMessage
Drop support for Context#originalMessage

The old `.message` is dropped, and the new `.message` is the old
`.originalMessage`.

Having a fake `.message` pretending a namespace command is a
top-level command seems entirely unnecessary, so I still don't
really understand what it's for in the first place.

KewlStatics/Alliance,Firestatics/omega,javi501/Lumen-Pokemon-Showdown,KewlStatics/Pokeindia-Codes,xfix/Pokemon-Showdown,Pikachuun/Pokemon-Showdown,abulechu/Lumen-Pokemon-Showdown,JennyPRO/Jenny,DarkSuicune/Kakuja-2.0,Hidden-Mia/Roleplay-PS,Guernouille/Pokemon-Showdown,sama2/Lumen-Pokemon-Showdown,HoeenCoder/SpacialGaze,kuroscafe/Paradox,Pablo000/aaa,SolarisFox/Pokemon-Showdown,yashagl/yash-showdown,lFernanl/Lumen-Pokemon-Showdown,AnaRitaTorres/Pokemon-Showdown,Pikachuun/Pokemon-Showdown,megaslowbro1/Pokemon-Showdown,DesoGit/Tsunami_PS,hayleysworld/serenityserver,Pablo000/aaa,Nineage/Origin,CharizardtheFireMage/Showdown-Boilerplate,SilverTactic/Dragotica-Pokemon-Showdown,Zarel/Pokemon-Showdown,cadaeic/Pokemon-Showdown,Irraquated/Pokemon-Showdown,TheManwithskills/COC,aakashrajput/Pokemon-Showdown,TbirdClanWish/Pokemon-Showdown,Hidden-Mia/Roleplay-PS,kotarou3/Krister-Pokemon-Showdown,azum4roll/Pokemon-Showdown,superman8900/Pokemon-Showdown,gustavo515/test,scotchkorean27/Pokemon-Showdown,urkerab/Pokemon-Showdown,MeliodasBH/boarhat,scotchkorean27/Pokemon-Showdown,TheManwithskills/COC,abrulochp/Dropp-Pokemon-Showdown,Ridukuo/Test,svivian/Pokemon-Showdown,AustinXII/Pokemon-Showdown,ankailou/Pokemon-Showdown,Firestatics/Firestatics46,hayleysworld/serenityc9,panpawn/Pokemon-Showdown,sama2/Lumen-Pokemon-Showdown,Ecuacion/Lumen-Pokemon-Showdown,SSJGVegito007/Vegito-s-Server,bai2/Dropp,zczd/enculer,KewlStatics/Shit,zek7rom/SpacialGaze,Sora-League/Sora,Wando94/Pokemon-Showdown,DarkSuicune/Kakuja-2.0,k3naan/Pokemon-Showdown,QuiteQuiet/Pokemon-Showdown,ehk12/bigbangtempclone,KewlStatics/Pokeindia-Codes,Bryan-0/Pokemon-Showdown,Alpha-Devs/Alpha-Server,DesoGit/Tsunami_PS,megaslowbro1/Pokemon-Showdown-Server-for-megaslowbro1,ShowdownHelper/Saffron,Celecitia/Plux-Pokemon-Showdown,Sora-Server/Sora,Flareninja/Showdown-Boilerplate,TheManwithskills/Dusk--Showdown,yashagl/yash-showdown,MeliodasBH/Articuno-Land,AWailOfATail/awoat,PrimalGallade45/Lumen-Pokemon-Showdown,Kokonoe-san/Glacia-PS,megaslowbro1/Pokemon-Showdown,CreaturePhil/Showdown-Boilerplate,Git-Worm/City-PS,KewlStatics/Showdown-Template,ShowdownHelper/Saffron,k3naan/Pokemon-Showdown,AustinXII/Pokemon-Showdown,MasterFloat/LQP-Server-Showdown,ehk12/coregit,TheFenderStory/Showdown-Boilerplate,Ridukuo/Test,ehk12/clone,urkerab/Pokemon-Showdown,ScottehMax/Pokemon-Showdown,AustinXII/Pokemon-Showdown,Flareninja/Showdown-Boilerplate,Flareninja/Lumen-Pokemon-Showdown,PS-Spectral/Spectral,JennyPRO/Jenny,Firestatics/Firestatics46,AWailOfATail/Pokemon-Showdown,panpawn/Gold-Server,JellalTheMage/Jellals-Server,gustavo515/test,Mystifi/Exiled,TheManwithskills/serenity,Bryan-0/Pokemon-Showdown,Volcos/SpacialGaze,AbsolitoSweep/Absol-server,JellalTheMage/Jellals-Server,DesoGit/TsunamiPS,Sora-Server/Sora,svivian/Pokemon-Showdown,Neosweiss/Pokemon-Showdown,xfix/Pokemon-Showdown,Alpha-Devs/Alpha-Server,KewlStatics/Alliance,QuiteQuiet/Pokemon-Showdown,Sora-League/Sora,KewlStatics/Showdown-Template,AWailOfATail/awoat,ZeroParadox/ugh,KaitoV4X/Showdown,MasterFloat/LQP-Server-Showdown,hayleysworld/Showdown-Boilerplate,xCrystal/Pokemon-Showdown,Flareninja/Lumen-Pokemon-Showdown,Kokonoe-san/Glacia-PS,aakashrajput/Pokemon-Showdown,anubhabsen/Pokemon-Showdown,megaslowbro1/Showdown-Server-again,Enigami/Pokemon-Showdown,brettjbush/Pokemon-Showdown,Pokemon-Devs/Pokemon-Showdown,Mystifi/Exiled,hayleysworld/Showdown-Boilerplate,MayukhKundu/Flame-Savior,TheFenderStory/Showdown-Boilerplate,Guernouille/Pokemon-Showdown,gustavo515/batata,psnsVGC/Wish-Server,lAlejandro22/lolipoop,CreaturePhil/Showdown-Boilerplate,Vacate/Pokemon-Showdown,Elveman/RPCShowdownServer,yashagl/pokemon-showdown,kupochu/Pokemon-Showdown,javi501/Lumen-Pokemon-Showdown,Zipzapadam/Server,abulechu/Lumen-Pokemon-Showdown,psnsVGC/Wish-Server,TheManwithskills/Server,urkerab/Pokemon-Showdown,SilverTactic/Dragotica-Pokemon-Showdown,ScottehMax/Pokemon-Showdown,ehk12/bigbangtempclone,BuzzyOG/Pokemon-Showdown,TbirdClanWish/Pokemon-Showdown,lFernanl/Zero-Pokemon-Showdown,TheManwithskills/Creature-phil-boiler,Git-Worm/City-PS,Wando94/Pokemon-Showdown,panpawn/Gold-Server,AWailOfATail/Pokemon-Showdown,Irraquated/Showdown-Boilerplate,Ecuacion/Lumen-Pokemon-Showdown,MayukhKundu/Flame-Savior,ehk12/clone,Enigami/Pokemon-Showdown,Flareninja/Pokemon-Showdown,BlazingAura/Showdown-Boilerplate,DB898/theregalias,RustServer/Pokemon-Showdown,EmmaKitty/Pokemon-Showdown,TheDiabolicGift/Lumen-Pokemon-Showdown,xCrystal/Pokemon-Showdown,SSJGVegito007/Vegito-s-Server,azum4roll/Pokemon-Showdown,panpawn/Pokemon-Showdown,yashagl/pokemon-showdown,MeliodasBH/Articuno-Land,PS-Spectral/Spectral,Firestatics/omega,Irraquated/Showdown-Boilerplate,HoeenCoder/SpacialGaze,TheDiabolicGift/Lumen-Pokemon-Showdown,TheFenderStory/Pokemon-Showdown,zek7rom/SpacialGaze,gustavo515/batata,xfix/Pokemon-Showdown,KewlStatics/Shit,TheManwithskills/Creature-phil-boiler,hayleysworld/serenityc9,xCrystal/Pokemon-Showdown,Nineage/Origin,jumbowhales/Pokemon-Showdown,kotarou3/Krister-Pokemon-Showdown,DarkSuicune/Pokemon-Showdown,HoeenCoder/SpacialGaze,xfix/Pokemon-Showdown,megaslowbro1/Pokemon-Showdown-Server-for-megaslowbro1,kuroscafe/Showdown-Boilerplate,sirDonovan/Pokemon-Showdown,theodelhay/test,kupochu/Pokemon-Showdown,Volcos/SpacialGaze,svivian/Pokemon-Showdown,svivian/Pokemon-Showdown,kuroscafe/Paradox,TheDiabolicGift/Showdown-Boilerplate,PrimalGallade45/Dropp-Pokemon-Showdown,Lauc1an/Perulink-Showdown,Vacate/Pokemon-Showdown,TheManwithskills/New-boiler-test,Syurra/Pokemon-Showdown,DarkSuicune/Pokemon-Showdown,gustavo515/gashoro,PS-Spectral/Spectral,Ecuacion/Pokemon-Showdown,Pikachuun/Pokemon-Showdown-SMCMDM,CharizardtheFireMage/Showdown-Boilerplate,TheManwithskills/DS,danpantry/Pokemon-Showdown,ehk12/coregit,Lord-Haji/SpacialGaze,Wando94/Spite,ShowdownHelper/Saffron,Sora-League/Sora,ZestOfLife/FestiveLife,NoahVSGamingYT/Pokemon-Showdown,sama2/Dropp-Pokemon-Showdown,AWailOfATail/Pokemon-Showdown,Pokemon-Devs/Pokemon-Showdown,sirDonovan/Pokemon-Showdown,ZeroParadox/ugh,Lord-Haji/SpacialGaze,Lord-Haji/SpacialGaze,Neosweiss/Pokemon-Showdown,lFernanl/Zero-Pokemon-Showdown,jumbowhales/Pokemon-Showdown,PrimalGallade45/Dropp-Pokemon-Showdown,TheFenderStory/Pokemon-Showdown,DB898/theregalias,anubhabsen/Pokemon-Showdown,TheDiabolicGift/Showdown-Boilerplate,ZestOfLife/PSserver,abrulochp/Lumen-Pokemon-Showdown,superman8900/Pokemon-Showdown,jumbowhales/Pokemon-Showdown,Zarel/Pokemon-Showdown,TheManwithskills/serenity,ZeroParadox/BlastBurners,jd4564/Pokemon-Showdown,TheManwithskills/Dusk--Showdown,Firestatics/Omega-Alpha,Zarel/Pokemon-Showdown,TheManwithskills/Server,hayleysworld/serenityserver,TheManwithskills/Server---Thermal,lAlejandro22/lolipoop,ZestOfLife/FestiveLife,AnaRitaTorres/Pokemon-Showdown,Elveman/RPCShowdownServer,aakashrajput/Pokemon-Showdown,hayleysworld/serenity,jd4564/Pokemon-Showdown,cadaeic/Pokemon-Showdown,Articuno-I/Pokemon-Showdown,gustavo515/gashoro,Lauc1an/Perulink-Showdown,abrulochp/Lumen-Pokemon-Showdown,PrimalGallade45/Lumen-Pokemon-Showdown,abulechu/Dropp-Pokemon-Showdown,JellalTheMage/PS-,megaslowbro1/Showdown-Server-again,svivian/Pokemon-Showdown,TheManwithskills/Server---Thermal,JellalTheMage/PS-,TheManwithskills/DS,Enigami/Pokemon-Showdown,DesoGit/Tsunami_PS,lFernanl/Pokemon-Showdown,SkyeTheFemaleSylveon/Pokemon-Showdown,sirDonovan/Pokemon-Showdown,Wando94/Spite,sama2/Dropp-Pokemon-Showdown,lFernanl/Lumen-Pokemon-Showdown,piiiikachuuu/Pokemon-Showdown,HoeenCoder/SpacialGaze,ankailou/Pokemon-Showdown,Celecitia/Plux-Pokemon-Showdown,bai2/Dropp,RustServer/Pokemon-Showdown,brettjbush/Pokemon-Showdown,BlazingAura/Showdown-Boilerplate,BuzzyOG/Pokemon-Showdown,BuzzyOG/Pokemon-Showdown,Alpha-Devs/OmegaRuby-Server,SkyeTheFemaleSylveon/Pokemon-Showdown,danpantry/Pokemon-Showdown,piiiikachuuu/Pokemon-Showdown,kuroscafe/Showdown-Boilerplate,Sora-Server/Sora,Zipzapadam/Server,EmmaKitty/Pokemon-Showdown,TheManwithskills/New-boiler-test,Irraquated/Pokemon-Showdown,DesoGit/TsunamiPS,Pikachuun/Pokemon-Showdown-SMCMDM,QuiteQuiet/Pokemon-Showdown,abrulochp/Dropp-Pokemon-Showdown,Kevinxzllz/PS-Openshift-Server,xfix/Pokemon-Showdown,forbiddennightmare/Pokemon-Showdown-1,gustavo515/final,Firestatics/Omega-Alpha,theodelhay/test,Flareninja/Pokemon-Showdown,Enigami/Pokemon-Showdown,KaitoV4X/Showdown,PauLucario/LQP-Server-Showdown,ZestOfLife/PSserver,forbiddennightmare/Pokemon-Showdown-1,Articuno-I/Pokemon-Showdown,Mystifi/Exiled,Syurra/Pokemon-Showdown,Kevinxzllz/PS-Openshift-Server,MeliodasBH/boarhat,arkanox/MistShowdown,arkanox/MistShowdown,SilverTactic/Showdown-Boilerplate,Ecuacion/Pokemon-Showdown,zczd/enculer,PauLucario/LQP-Server-Showdown,SolarisFox/Pokemon-Showdown,CreaturePhil/Showdown-Boilerplate,NoahVSGamingYT/Pokemon-Showdown,Alpha-Devs/OmegaRuby-Server,ZeroParadox/BlastBurners,SilverTactic/Showdown-Boilerplate,EienSeiryuu/Pokemon-Showdown,abulechu/Dropp-Pokemon-Showdown,gustavo515/final,lFernanl/Pokemon-Showdown,EienSeiryuu/Pokemon-Showdown,AbsolitoSweep/Absol-server,Irraquated/Pokemon-Showdown,panpawn/Gold-Server,hayleysworld/serenity