Add new demos to cmake: SerializeDemo and InternalEdgeDemo

Fix in btShapeHull for previous commit
Add support to serialize name for objects
Updated serialization structures.

src/BulletDynamics/Dynamics/btRigidBody.h

@@ -524,7 +524,7 @@ public:
 	virtual	int	calculateSerializeBufferSize()	const;
 
 	///fills the dataBuffer and returns the struct name (and 0 on failure)
-	virtual	const char*	serialize(void* dataBuffer) const;
+	virtual	const char*	serialize(void* dataBuffer,  class btSerializer* serializer) const;
 
 };