Fix glitches with last ~3 cards in hand.

Clean up touch management after adding the powerups.
Fix Ghosted 'A' on phone

... could use some auto-sizing of the font, perhaps, though...
Fix crash during replay
Hand update fixes #35

Cards in play on the board should not be displayed after updating...
Don't flush a played card
Close powerup tray when switching screens
Merge remote-tracking branch 'origin/master' into debugging