Moved away from singleton pattern

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

apps/wolf_3d_gui/lib/screens/sprite_gallery.dart

@@ -5,11 +5,11 @@ import 'package:wolf_3d_flutter/wolf_3d.dart';
 import 'package:wolf_3d_renderer/wolf_3d_asset_painter.dart';
 
 class SpriteGallery extends StatelessWidget {
-  final List<Sprite> sprites;
+  final Wolf3d wolf3d;
 
-  const SpriteGallery({super.key, required this.sprites});
+  const SpriteGallery({super.key, required this.wolf3d});
 
-  bool get isShareware => Wolf3d.I.activeGame.version == GameVersion.shareware;
+  bool get isShareware => wolf3d.activeGame.version == GameVersion.shareware;
 
   @override
   Widget build(BuildContext context) {
@@ -25,9 +25,8 @@ class SpriteGallery extends StatelessWidget {
           crossAxisSpacing: 8,
           mainAxisSpacing: 8,
         ),
-        itemCount: sprites.length,
+        itemCount: wolf3d.sprites.length,
         itemBuilder: (context, index) {
-          // --- Check which enemy owns this sprite ---
           String label = "Sprite Index: $index";
           for (final enemy in EnemyType.values) {
             if (enemy.claimsSpriteIndex(index, isShareware: isShareware)) {
@@ -36,14 +35,10 @@ class SpriteGallery extends StatelessWidget {
                 isShareware: isShareware,
               );
 
-              // Appends the enum name (e.g., "guard", "dog")
               label += "\n${enemy.name}";
-
-              // Appends the animation name
               if (animation != null) {
                 label += "\n${animation.name}";
               }
-
               break;
             }
           }
@@ -61,7 +56,7 @@ class SpriteGallery extends StatelessWidget {
                 Expanded(
                   child: AspectRatio(
                     aspectRatio: 4 / 3,
-                    child: WolfAssetPainter.sprite(sprites[index]),
+                    child: WolfAssetPainter.sprite(wolf3d.sprites[index]),
                   ),
                 ),
               ],