* Repairs the Object updates, Collision updates, and Child Prim methods making the bulletXNA engine work again.
* The only thing that had an issue was when creating a new RigidBody, BulletXNA didn't know the type SimMotionState and the upcast type is unknown in the constructor.   Therefore, I had to update the IMotionState with a new method 'SetBody'.    All of the duplicated type information has been removed and BulletXNA is not relying on any non-standard types external to the library.