Delegate all audio management to the new audio package, then manage that through a new wolf3d class

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

lib/game_select_screen.dart

@@ -1,6 +1,6 @@
 import 'package:flutter/material.dart';
 import 'package:wolf_3d_data_types/wolf_3d_data_types.dart';
-import 'package:wolf_dart/features/difficulty/difficulty_screen.dart';
+import 'package:wolf_dart/features/screens/episode_screen.dart';
 import 'package:wolf_dart/wolf_3d.dart';
 
 class GameSelectScreen extends StatelessWidget {
@@ -22,7 +22,7 @@ class GameSelectScreen extends StatelessWidget {
                 Wolf3d.I.setActiveGame(data);
                 Navigator.of(context).push(
                   MaterialPageRoute(
-                    builder: (context) => DifficultyScreen(),
+                    builder: (context) => const EpisodeScreen(),
                   ),
                 );
               },