feat: Enhance CLI and GUI to support configurable game data directory persistence

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

apps/wolf_3d_gui/lib/main.dart

@@ -7,24 +7,19 @@ library;
 
 import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
-import 'package:window_manager/window_manager.dart';
 import 'package:wolf_3d_flutter/wolf_3d_flutter.dart';
 
 /// Creates the application shell after loading available Wolf3D data sets.
 void main() async {
   WidgetsFlutterBinding.ensureInitialized();
 
-  if (supportsDesktopWindowing) {
-    await windowManager.ensureInitialized();
-  }
-
-  final Wolf3dFlutterEngine wolf3d = await Wolf3dFlutterEngine().init(
+  final Wolf3dFlutterEngine wolf3d = await Wolf3dFlutterEngine(
     debug: kDebugMode,
-  );
+  ).init();
 
   runApp(
     MaterialApp(
-      home: Wolf3dApp(wolf3d: wolf3d),
+      home: Wolf3dApp(engine: wolf3d),
     ),
   );
 }