Started 2d platformer demo.  This will serve as a testbed and will eventually pave the way to 2.5d.
Further refinements for the Hero class (hitbox).
Merge branch 'master' into physics and avoided annihilation

Conflicts:
	src/fwd.sln
- Added inheritance and an enemy.

- Mostly a temporary checkin before I update to the new animation engine
Merging up master and trimming down the platformer so it's not related to animations