fix some possible crashes on rotate

when rotating, the onPrepareDialog is called with possibly client or spiel being null
finish dialog: always clear name animation first

could be that the animation is still running from last time
wheel: redraw when spinning and not local player
wheel: never show wheel when player < 0
game: make gameFinishDialog a gameFinishActivity. Add Menu button to layout
game: show toast when player is out of moves