Commands: make /modlog compatible with OS X/BSD, fix silent error (#3480)
Commands: make /modlog compatible with OS X/BSD, fix silent error (#3480)

- tac isn't installed by default on OS X and flavours of BSD, which would
cause /modlog to fail in certain cases, so awk is used instead for them
- running /modlog all or /modlog public with a number of lines to
return rather than a string to query with now replies with an error
instead of treating "all" or "public" as literal rooms and trying to
read their modlog files
jumbowhales/Pokemon-Showdown,xfix/Pokemon-Showdown,sirDonovan/Pokemon-Showdown,panpawn/Pokemon-Showdown,QuiteQuiet/Pokemon-Showdown,aakashrajput/Pokemon-Showdown,Enigami/Pokemon-Showdown,Sora-League/Sora,Zarel/Pokemon-Showdown,svivian/Pokemon-Showdown,PS-Spectral/Spectral,AustinXII/Pokemon-Showdown,Lord-Haji/SpacialGaze,panpawn/Pokemon-Showdown,Lord-Haji/SpacialGaze,panpawn/Gold-Server,danpantry/Pokemon-Showdown,aakashrajput/Pokemon-Showdown,HoeenCoder/SpacialGaze,PS-Spectral/Spectral,AWailOfATail/Pokemon-Showdown,xCrystal/Pokemon-Showdown,DesoGit/Tsunami_PS,ShowdownHelper/Saffron,Zarel/Pokemon-Showdown,Mystifi/Exiled,xfix/Pokemon-Showdown,AustinXII/Pokemon-Showdown,xCrystal/Pokemon-Showdown,AWailOfATail/Pokemon-Showdown,CreaturePhil/Showdown-Boilerplate,Zarel/Pokemon-Showdown,xCrystal/Pokemon-Showdown,svivian/Pokemon-Showdown,Enigami/Pokemon-Showdown,AWailOfATail/Pokemon-Showdown,Mystifi/Exiled,svivian/Pokemon-Showdown,urkerab/Pokemon-Showdown,xfix/Pokemon-Showdown,panpawn/Gold-Server,Sora-League/Sora,Sora-League/Sora,urkerab/Pokemon-Showdown,QuiteQuiet/Pokemon-Showdown,Enigami/Pokemon-Showdown,jumbowhales/Pokemon-Showdown,ShowdownHelper/Saffron,HoeenCoder/SpacialGaze,urkerab/Pokemon-Showdown,sirDonovan/Pokemon-Showdown,xfix/Pokemon-Showdown,ShowdownHelper/Saffron,svivian/Pokemon-Showdown,Enigami/Pokemon-Showdown,HoeenCoder/SpacialGaze,aakashrajput/Pokemon-Showdown,panpawn/Gold-Server,xfix/Pokemon-Showdown,CreaturePhil/Showdown-Boilerplate,DesoGit/Tsunami_PS,PS-Spectral/Spectral,Mystifi/Exiled,sirDonovan/Pokemon-Showdown,QuiteQuiet/Pokemon-Showdown,jumbowhales/Pokemon-Showdown,CreaturePhil/Showdown-Boilerplate,danpantry/Pokemon-Showdown,HoeenCoder/SpacialGaze,Lord-Haji/SpacialGaze,svivian/Pokemon-Showdown,AustinXII/Pokemon-Showdown,DesoGit/Tsunami_PS