TODO:
-Profile the whole app and check for bottlenecks and memory leaks.  I'm putting this off until I have a stable version 01.  It's still too early,
-Possibly move all physics bodies inits, etc. to inside their respective custom Irrlicht nodes to better encapsulate and clean up InitNewGame method.  Probably do this after I'm satisfied with the complete state of each entity.  Still experimenting and debugging...

DONE:
-Finally implemented a proper ClearPhysics() method and destructor that deletes everything before exiting app.  Need to do the same with all the Irrlicht objects.  Right now I'm just using smgr->clear(),