#13 trump description on GUI should be better

[Sujee Maniyam]

The trump is displayed as the middle card of the table.
When the trump is uncovered
- (1) by trumpsettter cutting by trump
- (2) trumpsetter doing open-trump
- (3) another player guessing the trump
the actual card is displayed.

The following would be nice
- if the trump card is yet to be played (in case 3)
display it as 'enabled' card
- if trump card is already played 'disable' the card.
- also update the tool tip to reflect what happenend
to the trump (ie guessed / used by trump setter to win
a hand ..etc)