[refactor] Move tournament chat / tournament mode into GameController

[TsFreddie]

For a tournament lobby, it doesn't make sense to disable chatall and let players join as spectators.

Also, we shouldn't force chat to be team chat for spectators, (although we should still send them like it so players know tournament chat mode is on because they see green chat by default). But all-chat with tournament chat on should also send chat to other rooms. So spectators in tournament room can chat with all players in lobby room).

[TsFreddie]

Join/Leave messages should be muted for tournament players as well.