Big Cleanup, + Heart Refills

Added heart refills (for full & half hearts) to the game, with art,
sfx, and a place in the random loot dropper.

Streamlined bush killing.
Streamlined coin & heart refill acquisition.

Added red rupee pick up.

Further modularized some of the environmental entities. Will do more of
this soon.

Split components & general up a bit, into separate files for
organization's sake.