Peer-to-peer connections

[danielthepope]

Currently when a game is run, the admin and the players are all connected via the central server. This is OK for now, but if Buzzer were to get lots more traffic, it would be better if the players connect directly to the admin's device instead. This should lower latency if all players are in the same room, but it may make things worse if players are distributed; so this should be an option for the admin when setting up a game.