another large series of changes, related to the refactoring.

CompoundShapes are tricky to manage with respect to persistent contact points and swapped order of btCollisionObjects,
During dispatch, finding an algorith etc. order can be swapped.
fixed several other issues, related to SimpleBroadphase (removing a proxy was not working)

Demos/BspDemo/BspDemo.cpp

@@ -134,6 +134,7 @@ void	BspDemo::initPhysics(char* bspfilename)
 
 	///Setup a Physics Simulation Environment
 	m_dynamicsWorld = new btDiscreteDynamicsWorld();
+	m_dynamicsWorld->setGravity(-m_cameraUp);
 
 
 #ifdef QUAKE_BSP_IMPORTING