Added dynamic discovery of available game data

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

packages/wolf_3d_data/lib/src/wolfenstein_loader.dart

@@ -0,0 +1,48 @@
+import 'dart:typed_data';
+
+import 'classes/game_version.dart';
+import 'classes/wolfenstein_data.dart';
+// --- The Magic Conditional Import ---
+// If dart:io is available, use the real scanner. Otherwise, use the stub.
+import 'io/discovery_stub.dart'
+    if (dart.library.io) 'io/discovery_io.dart'
+    as platform;
+import 'wl_parser.dart';
+
+class WolfensteinLoader {
+  /// Scans a directory for Wolfenstein 3D data files and loads all available versions.
+  ///
+  /// NOTE: This will throw an [UnsupportedError] on Web platforms.
+  static Future<Map<GameVersion, WolfensteinData>> discover({
+    String? directoryPath,
+    bool recursive = false,
+  }) {
+    return platform.discoverInDirectory(
+      directoryPath: directoryPath,
+      recursive: recursive,
+    );
+  }
+
+  /// Parses WolfensteinData directly from raw ByteData.
+  /// This is 100% pure Dart and is safe to use on all platforms, including Web.
+  static WolfensteinData loadFromBytes({
+    required GameVersion version,
+    required ByteData vswap,
+    required ByteData mapHead,
+    required ByteData gameMaps,
+    required ByteData vgaDict,
+    required ByteData vgaHead,
+    required ByteData vgaGraph,
+  }) {
+    // We just act as a clean pass-through to the core parser
+    return WLParser.load(
+      version: version,
+      vswap: vswap,
+      mapHead: mapHead,
+      gameMaps: gameMaps,
+      vgaDict: vgaDict,
+      vgaHead: vgaHead,
+      vgaGraph: vgaGraph,
+    );
+  }
+}