Drop CardInfo’s own pixmap caches; use QPixmapCache instead.
Use QPixmap references instead of pointers.
Being stored in QPixmapCache, all card images are now subjected to
QPixmapCache’s size limit

reverted cardinfowidget to its original form at commit
95c6058d before i messed with
it. i didnt intend to make changes to it.

filter builder takes filter options from user, then adds
completed filters to the filter tree. the filter tree does
not currently do anything. in the future it will filter the
cards in the database view.

CIW will also dynamically hide/show power/toughness as well as loyalty.