feat: Implement Change View and Renderer Options menus

- Added functionality to display and navigate the Change View menu in SixelRenderer and SoftwareRenderer.
- Introduced methods to draw the Change View and Renderer Options menus, including handling cursor and selection states.
- Updated WolfClassicMenuArt to include a customize label for the new menu.
- Enhanced WolfMenuScreen to support new menu states.
- Created tests for Change View menu interactions, ensuring proper transitions and renderer settings toggling.
- Implemented persistence for renderer settings in Flutter, allowing settings to be saved and loaded from a local file.

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

packages/wolf_3d_dart/lib/wolf_3d_menu.dart

@@ -21,6 +21,7 @@ abstract class WolfMenuPic {
   static const int cNormal = 18; // C_NORMALPIC
   static const int cHard = 19; // C_HARDPIC
   static const int cControl = 23; // C_CONTROLPIC
+  static const int cCustomize = 24; // C_CUSTOMIZEPIC
   static const int cEpisode1 = 27; // C_EPISODE1PIC
   static const int cEpisode2 = 28; // C_EPISODE2PIC
   static const int cEpisode3 = 29; // C_EPISODE3PIC
@@ -115,6 +116,8 @@ class WolfClassicMenuArt {
 
   VgaImage? get optionsLabel => _imageForKey(MenuPicKey.optionsLabel);
 
+  VgaImage? get customizeLabel => _imageForKey(MenuPicKey.customizeLabel);
+
   VgaImage? get credits => _imageForKey(MenuPicKey.credits);
 
   VgaImage? episodeOption(int episodeIndex) {
@@ -189,6 +192,8 @@ class WolfClassicMenuArt {
         return MenuPicKey.difficultyHard;
       case WolfMenuPic.cControl:
         return MenuPicKey.controlBackground;
+      case WolfMenuPic.cCustomize:
+        return MenuPicKey.customizeLabel;
       case WolfMenuPic.cEpisode1:
         return MenuPicKey.episode1;
       case WolfMenuPic.cEpisode2: