feat: Add intro splash screen with transition effects and rendering support

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

packages/wolf_3d_renderer/lib/wolf_3d_glsl_renderer.dart

@@ -53,9 +53,7 @@ class _WolfGlslRendererState extends BaseWolfRendererState<WolfGlslRenderer> {
   }
 
   @override
-  Color get scaffoldColor => widget.engine.difficulty == null
-      ? _colorFromRgb(widget.engine.menuBackgroundRgb)
-      : const Color.fromARGB(255, 4, 64, 64);
+  Color get scaffoldColor => Colors.black;
 
   @override
   void dispose() {
@@ -149,10 +147,6 @@ class _WolfGlslRendererState extends BaseWolfRendererState<WolfGlslRenderer> {
       widget.onUnavailable?.call();
     }
   }
-
-  Color _colorFromRgb(int rgb) {
-    return Color(0xFF000000 | (rgb & 0x00FFFFFF));
-  }
 }
 
 class _GlslFramePainter extends CustomPainter {