Add userlist command (#2814)
Add userlist command (#2814)

A lot of users have been asking for a userlists command, may it be for bot purposes or for battle room usage.
AWailOfATail/Pokemon-Showdown,Pikachuun/Pokemon-Showdown,cadaeic/Pokemon-Showdown,urkerab/Pokemon-Showdown,aakashrajput/Pokemon-Showdown,jd4564/Pokemon-Showdown,Lord-Haji/SpacialGaze,CreaturePhil/Showdown-Boilerplate,urkerab/Pokemon-Showdown,Elveman/RPCShowdownServer,AWailOfATail/Pokemon-Showdown,Mystifi/Exiled,Zarel/Pokemon-Showdown,Kokonoe-san/Glacia-PS,panpawn/Pokemon-Showdown,EienSeiryuu/Pokemon-Showdown,zek7rom/SpacialGaze,DesoGit/Tsunami_PS,KewlStatics/Shit,PS-Spectral/Spectral,xfix/Pokemon-Showdown,Bryan-0/Pokemon-Showdown,ShowdownHelper/Saffron,Lord-Haji/SpacialGaze,Kokonoe-san/Glacia-PS,xfix/Pokemon-Showdown,urkerab/Pokemon-Showdown,Enigami/Pokemon-Showdown,Pikachuun/Pokemon-Showdown,AnaRitaTorres/Pokemon-Showdown,jumbowhales/Pokemon-Showdown,QuiteQuiet/Pokemon-Showdown,xCrystal/Pokemon-Showdown,Enigami/Pokemon-Showdown,danpantry/Pokemon-Showdown,xfix/Pokemon-Showdown,PS-Spectral/Spectral,Guernouille/Pokemon-Showdown,panpawn/Gold-Server,Git-Worm/City-PS,xCrystal/Pokemon-Showdown,svivian/Pokemon-Showdown,cadaeic/Pokemon-Showdown,Mystifi/Exiled,Enigami/Pokemon-Showdown,aakashrajput/Pokemon-Showdown,Sora-League/Sora,AnaRitaTorres/Pokemon-Showdown,KewlStatics/Alliance,DarkSuicune/Pokemon-Showdown,Bryan-0/Pokemon-Showdown,ShowdownHelper/Saffron,KewlStatics/Shit,TbirdClanWish/Pokemon-Showdown,AustinXII/Pokemon-Showdown,Volcos/SpacialGaze,Lord-Haji/SpacialGaze,Volcos/SpacialGaze,HoeenCoder/SpacialGaze,svivian/Pokemon-Showdown,AustinXII/Pokemon-Showdown,ShowdownHelper/Saffron,QuiteQuiet/Pokemon-Showdown,azum4roll/Pokemon-Showdown,danpantry/Pokemon-Showdown,Enigami/Pokemon-Showdown,jumbowhales/Pokemon-Showdown,aakashrajput/Pokemon-Showdown,panpawn/Gold-Server,DesoGit/Tsunami_PS,Guernouille/Pokemon-Showdown,Elveman/RPCShowdownServer,xfix/Pokemon-Showdown,Zarel/Pokemon-Showdown,TbirdClanWish/Pokemon-Showdown,QuiteQuiet/Pokemon-Showdown,HoeenCoder/SpacialGaze,DesoGit/Tsunami_PS,Sora-League/Sora,panpawn/Gold-Server,jd4564/Pokemon-Showdown,svivian/Pokemon-Showdown,jumbowhales/Pokemon-Showdown,AustinXII/Pokemon-Showdown,KewlStatics/Alliance,svivian/Pokemon-Showdown,EienSeiryuu/Pokemon-Showdown,xfix/Pokemon-Showdown,zek7rom/SpacialGaze,sirDonovan/Pokemon-Showdown,HoeenCoder/SpacialGaze,xCrystal/Pokemon-Showdown,CreaturePhil/Showdown-Boilerplate,Git-Worm/City-PS,sirDonovan/Pokemon-Showdown,AWailOfATail/Pokemon-Showdown,sirDonovan/Pokemon-Showdown,HoeenCoder/SpacialGaze,panpawn/Pokemon-Showdown,PS-Spectral/Spectral,Mystifi/Exiled,azum4roll/Pokemon-Showdown,SolarisFox/Pokemon-Showdown,DarkSuicune/Pokemon-Showdown,Sora-League/Sora,Zarel/Pokemon-Showdown,CreaturePhil/Showdown-Boilerplate,SolarisFox/Pokemon-Showdown,svivian/Pokemon-Showdown