Tourney control: Set passwords

[GoogleFrog]

Some tournament in the future might want to not have spectators. A neat way to do this would be to give rooms passwords. Players do not need a password to be forced into the room, and they should probably be able to join their room manually regardless of what password they send.

The idea came up in the context of fight club. So the mass-creation tool would have to support passwords. All the rooms could have the same password though (similar to all the rooms having the same modoptions, if the modoption feature is implemented).