Server is multithreaded, but no connection is visible

UDPNetworkUtility and ConfigUtility are now using the ServiceLocator
pattern in the server, and networkQueue() is running in a separate thread
in the server. However, there seems to be a problem somewhere, since the
broadcast request & response are not producing any visible output.

client/scene_manager.cpp

@@ -145,7 +145,10 @@ void SceneManager::Quit() {
 	surfaceMgr = ServiceLocator<SurfaceManager>::Set(nullptr);
 	netUtil = ServiceLocator<UDPNetworkUtility>::Set(nullptr);
 
+	//clean up the scene
 	UnloadScene();
+
+	//deinitialize the APIs
 	SDLNet_Quit();
 	SDL_Quit();
 }