Starting to move data loader to its own package

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

lib/features/map/wolf_level.dart

@@ -1,11 +1,11 @@
-import 'package:wolf_dart/classes/matrix.dart';
+import 'package:wolf_3d_data/wolf_3d_data.dart';
 
 class WolfLevel {
   final String name;
   final int width; // Always 64 in standard Wolf3D
   final int height; // Always 64
-  final Matrix<int> wallGrid;
-  final Matrix<int> objectGrid;
+  final Sprite wallGrid;
+  final Sprite objectGrid;
 
   WolfLevel({
     required this.name,