animated sprite sheet handler

animated sprite sheets can now be loaded rather effortlessly. The
loading_flower_sprite.as is a shortcut for loading the embeded png.
Benifits include speedy loading (cause it just one file instead of 16)
and we can support actually transparent images like png files (instead
of hard-matted formats like gif. Is there an animated gif torch we can
test with?
Keyboard event handler

data_helpers/KeyCode.as - awesome find.