Improved feedback in image markups

Now the number of attempts the player has left is displayed. In this case 3 extra attempts per question.

Games of the game type image markups have been updated. The number of attempts/guesses is now displayed with hearts as in other game types. In addition, the game creator (when creating a user game) can now choose whether the number of extra attempts should be limited per question or per game round.

We have also made several minor visual improvements to the game type.

The number of extra attempts (0-10) and whether it should be per question or per game round.