Moved away from singleton pattern

Signed-off-by: Hans Kokx <hans.d.kokx@gmail.com>

apps/wolf_3d_gui/lib/main.dart

@@ -5,11 +5,11 @@ import 'package:wolf_3d_gui/screens/game_select_screen.dart';
 void main() async {
   WidgetsFlutterBinding.ensureInitialized();
 
-  await Wolf3d.I.init();
+  final Wolf3d wolf3d = await Wolf3d().init();
 
   runApp(
-    const MaterialApp(
-      home: GameSelectScreen(),
+    MaterialApp(
+      home: GameSelectScreen(wolf3d: wolf3d),
     ),
   );
 }