[PA3] Implement Cards rescaling

[Sencudra]

Do not “pre-allocate” space for all 81 possible cards. At any given time, cards should
be as large as possible given the screen real estate available to cards and the number of
cards currently in play. In other words, when the game starts (with only 12 cards), the
cards will be pretty big, but as more and more cards appear on screen (due to Deal 3
More Cards), they will have to get smaller and smaller to fit.