Implement save file dialog functionality across platforms

- Added ShowSaveFileDialog and its platform-specific implementations for Windows and macOS, allowing users to save files with specified names and extensions.
- Enhanced the FileDialogWrapper class to support both native and bespoke dialog options based on feature flags.
- Updated the editor manager to utilize the new save dialog for ROM and project file saving, improving user experience and file management.
- Refactored existing dialog methods to ensure consistency and maintainability across different platforms.

src/app/gui/style.cc

@@ -7,6 +7,7 @@
 #include "app/gui/background_renderer.h"
 #include "core/platform/font_loader.h"
 #include "gui/color.h"
+#include "gui/icons.h"
 #include "imgui/imgui.h"
 #include "imgui/imgui_internal.h"
 #include "util/log.h"
@@ -438,7 +439,7 @@ void BeginCanvasTableCell(ImVec2 min_size) {
     
     // Reserve space for the canvas
     ImGui::Dummy(actual_size);
-    ImGui::SetCursorPos(ImGui::GetCursorPos() - actual_size); // Reset cursor for drawing
+    // ImGui::SetCursorPos(ImGui::GetCursorPos() - actual_size); // Reset cursor for drawing
   }
 }