Refactor audio handling in Wolfenstein 3D

- Updated main.dart to use NativeSubprocessAudio instead of CliSubprocessAudio.
- Introduced DebugMusicPlayer interface for music playback.
- Implemented NativeSubprocessAudio for native audio handling with subprocesses.
- Added SilentAudio class as a no-op fallback for audio.
- Removed deprecated FlutterAudioAdapter and default audio backend implementations.
- Integrated Wolf3dPlatformAudio to manage audio across platforms, selecting between NativeSubprocessAudio and an embedded audio player.
- Updated wolf_3d_engine.dart to use SilentAudio as the default audio backend.
- Cleaned up audio-related files and ensured proper audio initialization and playback functionality.

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

apps/wolf_3d_cli/bin/main.dart

@@ -7,7 +7,7 @@ library;
 import 'dart:io';
 
 import 'package:wolf_3d_cli/cli_game_loop.dart';
-import 'package:wolf_3d_cli/cli_subprocess_audio.dart';
+import 'package:wolf_3d_dart/wolf_3d_audio.dart';
 import 'package:wolf_3d_dart/wolf_3d_data.dart';
 import 'package:wolf_3d_dart/wolf_3d_data_types.dart';
 import 'package:wolf_3d_dart/wolf_3d_engine.dart';
@@ -63,7 +63,7 @@ void main() async {
       stdout.terminalLines,
     ),
     input: CliInput(),
-    engineAudio: CliSubprocessAudio(),
+    engineAudio: NativeSubprocessAudio(),
     onGameWon: () => stopAndExit(0),
     onQuit: () => stopAndExit(0),
     saveGamePersistence: DefaultSaveGamePersistence(),