Revert "- HP.getBitmap() -> HP.getBitmapData() (makes more sense)"

This reverts commit 19ed1b2eff725711dce6dd7ab479482d73089f28.
Implementing sound and:
 - HP.getBitmap() -> HP.getBitmapData() (makes more sense)
 - HP.getSound() (same as getBitmapData() but for sounds)
 - Sfx class ported but not tested yet
 - pushed some sound files from PiratePig (for testing) (reverted from commit 19ed1b2eff725711dce6dd7ab479482d73089f28)