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/src/registry/built_in/retail_menu_module.dart

@@ -31,6 +31,7 @@ class RetailMenuPicModule extends MenuPicModule {
     MenuPicKey.footer: 15, // C_MOUSELBACKPIC (footer art)
     MenuPicKey.heading: 3, // H_TOPWINDOWPIC
     MenuPicKey.optionsLabel: 7, // C_OPTIONSPIC
+    MenuPicKey.customizeLabel: 24, // C_CUSTOMIZEPIC
     // --- Cursor / markers ---
     MenuPicKey.cursorActive: 8, // C_CURSOR1PIC
     MenuPicKey.cursorInactive: 9, // C_CURSOR2PIC

packages/wolf_3d_dart/lib/src/registry/built_in/shareware_menu_module.dart

@@ -31,6 +31,7 @@ class SharewareMenuPicModule extends MenuPicModule {
     MenuPicKey.footer: 15,
     MenuPicKey.heading: 3,
     MenuPicKey.optionsLabel: 7,
+    MenuPicKey.customizeLabel: 36,
     MenuPicKey.cursorActive: 8,
     MenuPicKey.cursorInactive: 9,
     MenuPicKey.markerSelected: 11,
@@ -57,6 +58,7 @@ class SharewareMenuPicModule extends MenuPicModule {
     MenuPicKey.footer: 27,
     MenuPicKey.heading: 14,
     MenuPicKey.optionsLabel: 19,
+    MenuPicKey.customizeLabel: 36,
     MenuPicKey.cursorActive: 20,
     MenuPicKey.cursorInactive: 21,
     MenuPicKey.markerSelected: 23,

packages/wolf_3d_dart/lib/src/registry/keys/menu_pic_key.dart

@@ -10,6 +10,7 @@ enum MenuPicKey {
   footer('footer'),
   heading('heading'),
   optionsLabel('optionsLabel'),
+  customizeLabel('customizeLabel'),
 
   // --- Cursor / selection markers ---
   cursorActive('cursorActive'),