Refactor Users.users/Users.prevUsers updates
Refactor Users.users/Users.prevUsers updates

Updating these maps are now done in the specific functions Users.add,
Users.delete, Users.move, and Users.merge.

No other function should modify these maps at all.

cadaeic/Pokemon-Showdown,xfix/Pokemon-Showdown,xfix/Pokemon-Showdown,Guernouille/Pokemon-Showdown,TbirdClanWish/Pokemon-Showdown,Bryan-0/Pokemon-Showdown,CharizardtheFireMage/Showdown-Boilerplate,jumbowhales/Pokemon-Showdown,ShowdownHelper/Saffron,CreaturePhil/Showdown-Boilerplate,ZestOfLife/FestiveLife,Volcos/SpacialGaze,jd4564/Pokemon-Showdown,panpawn/Gold-Server,Enigami/Pokemon-Showdown,xfix/Pokemon-Showdown,SolarisFox/Pokemon-Showdown,urkerab/Pokemon-Showdown,PS-Spectral/Spectral,xCrystal/Pokemon-Showdown,svivian/Pokemon-Showdown,Lord-Haji/SpacialGaze,CreaturePhil/Showdown-Boilerplate,AustinXII/Pokemon-Showdown,cadaeic/Pokemon-Showdown,Enigami/Pokemon-Showdown,TbirdClanWish/Pokemon-Showdown,QuiteQuiet/Pokemon-Showdown,Sora-League/Sora,zek7rom/SpacialGaze,xCrystal/Pokemon-Showdown,HoeenCoder/SpacialGaze,svivian/Pokemon-Showdown,Mystifi/Exiled,Kokonoe-san/Glacia-PS,QuiteQuiet/Pokemon-Showdown,svivian/Pokemon-Showdown,DesoGit/Tsunami_PS,Kokonoe-san/Glacia-PS,aakashrajput/Pokemon-Showdown,svivian/Pokemon-Showdown,jd4564/Pokemon-Showdown,ShowdownHelper/Saffron,Sora-League/Sora,HoeenCoder/SpacialGaze,Lord-Haji/SpacialGaze,azum4roll/Pokemon-Showdown,Flareninja/Showdown-Boilerplate,Pikachuun/Pokemon-Showdown,PS-Spectral/Spectral,DesoGit/TsunamiPS,AnaRitaTorres/Pokemon-Showdown,Git-Worm/City-PS,EienSeiryuu/Pokemon-Showdown,AustinXII/Pokemon-Showdown,urkerab/Pokemon-Showdown,ZestOfLife/FestiveLife,AnaRitaTorres/Pokemon-Showdown,AWailOfATail/Pokemon-Showdown,DarkSuicune/Pokemon-Showdown,panpawn/Pokemon-Showdown,sirDonovan/Pokemon-Showdown,CreaturePhil/Showdown-Boilerplate,sirDonovan/Pokemon-Showdown,DesoGit/TsunamiPS,Guernouille/Pokemon-Showdown,zek7rom/SpacialGaze,jumbowhales/Pokemon-Showdown,SolarisFox/Pokemon-Showdown,QuiteQuiet/Pokemon-Showdown,HoeenCoder/SpacialGaze,Zarel/Pokemon-Showdown,Sora-League/Sora,panpawn/Pokemon-Showdown,xCrystal/Pokemon-Showdown,Bryan-0/Pokemon-Showdown,PS-Spectral/Spectral,Flareninja/Showdown-Boilerplate,AWailOfATail/Pokemon-Showdown,Enigami/Pokemon-Showdown,KewlStatics/Alliance,Lord-Haji/SpacialGaze,Git-Worm/City-PS,Mystifi/Exiled,Zarel/Pokemon-Showdown,svivian/Pokemon-Showdown,Volcos/SpacialGaze,Enigami/Pokemon-Showdown,panpawn/Gold-Server,KewlStatics/Shit,urkerab/Pokemon-Showdown,DesoGit/Tsunami_PS,Elveman/RPCShowdownServer,panpawn/Gold-Server,xfix/Pokemon-Showdown,Zarel/Pokemon-Showdown,DesoGit/Tsunami_PS,Pikachuun/Pokemon-Showdown,CharizardtheFireMage/Showdown-Boilerplate,aakashrajput/Pokemon-Showdown,danpantry/Pokemon-Showdown,azum4roll/Pokemon-Showdown,sirDonovan/Pokemon-Showdown,DarkSuicune/Pokemon-Showdown,Elveman/RPCShowdownServer,AWailOfATail/Pokemon-Showdown,KewlStatics/Shit,KewlStatics/Alliance,AustinXII/Pokemon-Showdown,jumbowhales/Pokemon-Showdown,Mystifi/Exiled,HoeenCoder/SpacialGaze,ShowdownHelper/Saffron,aakashrajput/Pokemon-Showdown,danpantry/Pokemon-Showdown,xfix/Pokemon-Showdown,EienSeiryuu/Pokemon-Showdown