Makes vehicles work with the physics plugins.

Makes vehicles create a basic physics body when using one of the physics plugins so that they can collide with other physics-enabled objects.

Based on @rextimmy 's work.

Engine/source/T3D/physics/physicsBody.h

@@ -113,6 +113,10 @@ public:
 
    ///
    virtual void applyImpulse( const Point3F &origin, const Point3F &force ) = 0;
+
+   ///
+   virtual void moveKinematicTo(const MatrixF &xfm) = 0;
+
 };