Enhance OverworldEditor with new customization features

- Updated OverworldEditor to include new table columns for CopyMap, MapLock, CustomBG, and Overlay, improving user interaction and customization options.
- Implemented DrawCustomBackgroundColorEditor and DrawOverlayEditor methods for managing custom background colors and overlay settings, respectively.
- Added context menu functionality for map locking and quick access to map properties, enhancing usability.
- Refactored OverworldMap to support new features related to animated graphics and subscreen overlays, ensuring compatibility with ZScreamCustomOverworld v3.

src/app/gui/canvas.h

@@ -165,6 +165,7 @@ class Canvas {
   auto draw_list() const { return draw_list_; }
   auto zero_point() const { return canvas_p0_; }
   auto scrolling() const { return scrolling_; }
+  void set_scrolling(ImVec2 scroll) { scrolling_ = scroll; }
   auto drawn_tile_position() const { return drawn_tile_pos_; }
   auto canvas_size() const { return canvas_sz_; }
   void set_global_scale(float scale) { global_scale_ = scale; }