Add Native File Dialog support and enhance file dialog management

- Introduced a feature flag to toggle between Native File Dialog (NFD) and bespoke file dialog implementations.
- Updated FileDialogWrapper to utilize the feature flag for opening files and folders, improving cross-platform compatibility.
- Enhanced the UI to allow users to configure the file dialog mode, providing better user control over file handling.
- Added new methods for testing both NFD and bespoke implementations directly from the UI, improving testing capabilities.
- Updated test management to include options for enabling/disabling individual tests, enhancing flexibility in test execution.

src/app/core/features.h

@@ -38,6 +38,9 @@ class FeatureFlags {
     // Log to the console.
     bool kLogToConsole = false;
 
+    // Use NFD (Native File Dialog) instead of bespoke file dialog implementation.
+    bool kUseNativeFileDialog = true;
+
     // Overworld flags
     struct Overworld {
       // Load and render overworld sprites to the screen. Unstable.
@@ -100,6 +103,8 @@ class FeatureFlags {
               std::to_string(get().overworld.kLoadCustomOverworld) + "\n";
     result += "kApplyZSCustomOverworldASM: " +
               std::to_string(get().overworld.kApplyZSCustomOverworldASM) + "\n";
+    result += "kUseNativeFileDialog: " +
+              std::to_string(get().kUseNativeFileDialog) + "\n";
     return result;
   }
 };
@@ -145,6 +150,7 @@ struct FlagsMenu {
     Checkbox("Enable Console Logging", &FeatureFlags::get().kLogToConsole);
     Checkbox("Log Instructions to Emulator Debugger",
              &FeatureFlags::get().kLogInstructions);
+    Checkbox("Use Native File Dialog (NFD)", &FeatureFlags::get().kUseNativeFileDialog);
   }
 };