I compare the card pt, to the card with the same name in the db. if the
card is found, we compare the pt, of the db item and the item in play.
If there is not a match then we change the color of the PT. This is
pretty much the same as mtgo does it.

I looked into having only the P, or the T colored, though this is not
posible, when you set a pen color you can not change it partway through
painting a string. That would require 3 strings painted, one for p, /
and t. Which is more effort than its worth. This does the job pretty
well.

I have also moved the pt slightly to the left so it lines up better. I
have some images to compate.

+ Updated DELTA variable to more suitable name:
ROTATION_DEGREES_PER_FRAME

+ Cards now animate smoother and faster
+ removed redundant computations performed each frame

Click-holding on a card then immediately releasing now properly changes the
cursor from a closed hand back to an open hand

if cards in multiple zones are selected, don't create drag items for the ones you're not supposed to move

Revealing a library to a player now grants that player permission to drag cards out of that library onto his own table. This permission is revoked by shuffling the library. The zone view window tracks content changes of the zone for as long as the permission lasts so that card ID changes are kept track of. This hopefully fixes issues #5 and #12.

stop card tap/untap animation in CardItem::resetState() to avoid unfinished animation during zone change