More improvements

Multiplayer improvements and level handling improvements, music now stops at the end of the level and you have a little time to fly around at the end of the level to go after the other players before hyperspacing to the next level. Clients will now quit when the host quits or server timeout so players can restart app and reconnect with a new host, it would be nicer to automatically transform a client to a host when the host goes down but its probably not an easy thing to do at this point.