add rudimentary command logging for shared memory physics server

examples/SharedMemory/PhysicsServerExample.h

@@ -4,6 +4,7 @@
 enum PhysicsServerOptions
 {
 	PHYSICS_SERVER_ENABLE_COMMAND_LOGGING=1,
+	PHYSICS_SERVER_REPLAY_FROM_COMMAND_LOG=2,
 };
 
 class CommonExampleInterface*    PhysicsServerCreateFunc(struct CommonExampleOptions& options);