Add /host and /skip commands.

"/host playername": changes the host of the game to the specified player (who must already be in the game).  Useful for tournament-style or other prearranged play to hand over "ownership" of a game without having to create a separate game.  Also useful to "recover" host status if the host is disconnected, but this requires the cooperation of whoever became host in the meantime.

"/skip playername": skips the specified player in the same manner as the idle timer, except that it does not increment their skip count and will never cause a game reset (it will just skip the round if there aren't enough players).  Mostly intended to allow manually skipping an AFK player when playing with the idle timer disabled.  (This was one of the things I added before I found the bugfix for the idle timer.)

Both of these commands will only work for admins and hosts.