make one of the cubes in two_cubes.sdf static (immovable) using the <static> tag in SDF

add an example using 'direct'
fix the send-desired-state commands, to add flags for arguments set, using default values.
Start exposing SDF loading in shared memory api, not fully implemented yet.

examples/SharedMemory/PhysicsDirect.h

@@ -19,6 +19,8 @@ protected:
 
 	bool processDebugLines(const struct SharedMemoryCommand& orgCommand);
 
+	bool processCamera(const struct SharedMemoryCommand& orgCommand);
+
 public:
 
     PhysicsDirect();