Add option of playing out the match after winner is decided

[jkledal]

When playing more than two people at a time, as the winner is decided it would be nice to have the option of "play out" vs. "finish game", so that a 2nd, 3rd, 4th place and so on may be decided.

Also when playing modes like "first to 2 legs", this would serve as the 2nd place being the second to win two legs.