feat: Implement audio backend with subprocess support and refactor audio handling

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

apps/wolf_3d_cli/bin/main.dart

@@ -7,6 +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_data.dart';
 import 'package:wolf_3d_dart/wolf_3d_data_types.dart';
 import 'package:wolf_3d_dart/wolf_3d_engine.dart';
@@ -46,13 +47,15 @@ void main() async {
   }
 
   CliGameLoop? gameLoop;
+  late final WolfEngine engine;
 
   void stopAndExit(int code) {
     gameLoop?.stop();
+    engine.audio.dispose();
     exitCleanly(code);
   }
 
-  final engine = WolfEngine(
+  engine = WolfEngine(
     availableGames: availableGames.values.toList(growable: false),
     startingEpisode: 0,
     frameBuffer: FrameBuffer(
@@ -60,11 +63,13 @@ void main() async {
       stdout.terminalLines,
     ),
     input: CliInput(),
+    engineAudio: CliSubprocessAudio(),
     onGameWon: () => stopAndExit(0),
     onQuit: () => stopAndExit(0),
     saveGamePersistence: DefaultSaveGamePersistence(),
   );
 
+  await engine.audio.init();
   engine.init();
 
   final persistence = DefaultRendererSettingsPersistence();