Added support for RigidStatic actors
Added a change to RigidDynamic Actors:
 a mass of FLT_MAX is an indicator that the dynamic actor is kinematic (the object doesn't move dynamically, but it affects other dynamic objects in the scene as though it has infinte mass)

TODO:
Write code to handle Level geometry by way of TriangleMesh actors (solid geometry) and Height fields (terrain)