Added autocompletion for /uh timers
Fixed autocompletion of /togglechat <team ...>.

(Wasn't working for multiple-world team names.)
Renamed /uh team addplayer & removeplayer to join & leave.

Shorter, and much more autocompletion-friendly:
 - old: /uh te<TAB> addp<TAB>
 - new: /uh te<TAB> j<TAB>