donate: remove retry functionality, start IAB purchase flow even when no connection

leave buttons labeled "Unknown" but enabled. Makes things easy when user
wants to select "Nothing" when fetch failed
game: show toast also when other players has been blocked
game: skip yellow and green in details when in 2 player mode
wheel: remove TODO. current situation is perfect
general: add target api hint to suppress lint warning
game finish: add ribbon icon to finish dialog
stuff: stone overlay with red and green overlay