Disconnect/reconnect to game; join game in-progress

[ptwu]

"Right now we have to wait for all people to join game before starting the game. Can we allow people to join, leave and rejoin? I guess you will need to put people who join/rejoined at the end of the queue. Or put them in a virtual waiting room and when the current hand is over, restarting the game (but preserve each person's chip amount)."