Added basic transition system that works with GameApp's phases. Currently does a fade-out between elements, which works well in some places and not-so-well in others. We'll definitely want to think about where and where not to use it... they'd work a lot better if we could spawn a thread to handle loading the next state while transitioning.
Also cleaned up the shop a bit, so it uses ReadButton() instead of GetButtonClick()-- hence the slight change to JGE. Added a tiled image for the task board, which loads conservatively (I tried 128x128, but it didn't look as good).
* Removed all calls to Release(JQuad*).
* Updated flatten(). Prior flatten was buggy beyond belief.
* Done some extensive testing, but if this causes more trouble than it fixes, we'll have to revert. It's too close to release time.
* Moved shop text ("press square for other cards") etc, to ShopItems, so they rendered properly (all in one place, after AA)
* The AA is really more a proof of concept than anything else. To do it properly I'd need a double-resolution copy of shop.jpg.
* The real multicolored card has a greenish tint, and is darker. What do you think of gold.jpg? Should we tint it more that way?
