Gamemodes that haphazardly crash two or more other gamemodes together are now explained in their voting option, so we can stop having to explain it to OoC literally every round
-allow voting for most mixed gamemodes, with exception of bughunt and infection
-adds crossfire(merc and heister), also adds a raider frequency to don't mix them with mercs
-adds siege(rev and merc)
-adds visitors(ninja and wizard)
