Control tweaking, standardized metric, JUMPING!
* Controls are now WASD for walk/strafe, arrows for look
* Additionally: Space JUMPS with proper gravity, E/F fly and temporarily disrupt gravity, although there isn't a 'fly mode' yet - gravity will catch up when you let go of the key
* Bug/Feature? Can't fly through the ground.  Feature because you should have to hold a modifier to clip, bug because it's a side effect of the ordering of the code.
* Cheat: Collision detection isn't really happening, it's just looking to make sure you are at 2m (2*128) above y=0.  Terrain changes while supported would not provide hills to climb.
* Standardized metric: 1 meter is 128 units.  Here is the cool part: after settling on this, I set the force of gravity to (9.81 * 128) and it looks just right.  You can jump a bit higher than the average human but that's to be expected from a FPS interface.