* Make cards rounded
Magic cards have rounded corners, and playing cards tend to have rounded
corners as well, but Cockatrice currently displays rectangular cards.
This can cause visual glitches when using image scans where the border
does not extend in the corner, and for this reason Cockatrice always
draws a (rectangular) border around the card to try and make it look a
bit better.
In this patch I take a different approach: rather than try to make
rounded pegs, er, cards, go into a square hole, the hole is now rounded.
More precisely, the AbstractCardItem now has a rounded rectangular shape
(with a corner of 5% of the width of the card, identical to that of
modern M:TG physical cards).
As a side effect, the card drawing gets a bit simplified by getting rid
of transformPainter() when drawing the card outline and using the
QPainter::drawPixmap overloads that takes a target QRectF instead. This
means we no longer have to bother about card rotation when painting
since that's taken care of by the Graphics View framework (which
transformPainter() undoes).
* format
* Also give PileZone rounded corners
* Forgot untap status + bits of CardDragItem
* fix deckviewcard calculations
* Rounded CardInfoPicture
