Add Overworld accessors and enhance testing framework

- Introduced new methods in `Controller`, `EditorManager`, and `OverworldEditor` to access the `Overworld` instance, improving modularity and interaction with the overworld data.
- Added `GetTile` method in `Overworld` to retrieve tile data based on coordinates, enhancing functionality for tile manipulation.
- Implemented a new testing framework with automated GUI tests, including `CanvasSelectionTest` and `FrameworkSmokeTest`, to validate user interactions and ensure robustness.
- Updated `CMakeLists.txt` to include new test files and dependencies, streamlining the build process for testing.
- Refactored logging behavior to ensure proper file handling during logging operations, improving reliability in logging outputs.

src/app/editor/overworld/overworld_editor.h

@@ -94,6 +94,7 @@ class OverworldEditor : public Editor, public gfx::GfxContext {
   absl::Status Find() override { return absl::UnimplementedError("Find"); }
   absl::Status Save() override;
   absl::Status Clear() override;
+  zelda3::Overworld& overworld() { return overworld_; }
   
   /**
    * @brief Apply ZSCustomOverworld ASM patch to upgrade ROM version