pushed some UI updating to subclasses for richer flip description in Set game; parameterized flip cost and whether matched cards should be removed from play
changed the Set description field from a text view to a generic UI view
pushed updating of flip description to subclasses; parameterized whether matched cards should be removed from play
added a property specifying whether card should be drawn with a border, which is false when drawing the card in the flip description area
began implementation of richer flip description area