fix: game always closing with exitcode 0

Minecraft.Client/Windows64/Windows64_Minecraft.cpp

@@ -386,6 +386,9 @@ LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
 			pMinecraft->soundEngine->playMusicTick();
     	}
     break;
+	case WM_CLOSE:
+		app.ExitGame();
+		break;
 	case WM_DESTROY:
 		PostQuitMessage(0);
 		break;
@@ -1283,10 +1286,18 @@ int APIENTRY _tWinMain(_In_ HINSTANCE hInstance,
 		// A memory leak was caused because the icon renderer kept creating new Vec3's because the pool wasn't reset
 		Vec3::resetPool();
 	}
-	
-	//str1k3r - Safely exit the game
-	app.ExitGame();
 
+	//str1k3r - unregister the minecraft window class
+	UnregisterClass("MinecraftClass", g_hInst);
+
+	//str1k3r - shutdown Iggy
+	ui.shutdown();
+	IggyShutdown();
+
+	//str1k3r - cleanup DirectX stuff
+	CleanupDevice();
+
+	//str1k3r - pass exitcode to OS, removed app.ExitGame() as that made it always exit with 0
 	return (int)msg.wParam;
 }