[desktop] Data Manager, data import/export (#2700)

This adds a "Data Manager" dialog to the Tools menu. The Data Manager allows for the following operations:
- Open w/ system file manager
- Clear
- Export
- Import

On any of the following directories:
- Save (w/ profile selector)
- UserNAND
- SysNAND
- Mods
- Shaders

TODO for the future:
- "Cleanup" for each directory
- TitleID -> Game name--let users clean data for a specific game if applicable

Signed-off-by: crueter <crueter@eden-emu.dev>
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/2700
Reviewed-by: MaranBr <maranbr@eden-emu.dev>
Reviewed-by: Lizzie <lizzie@eden-emu.dev>

src/qt_common/qt_frontend_util.cpp

@@ -32,4 +32,15 @@ const QString GetOpenFileName(const QString &title,
 #endif
 }
 
+const QString GetSaveFileName(const QString &title,
+                              const QString &dir,
+                              const QString &filter,
+                              QString *selectedFilter,
+                              Options options)
+{
+#ifdef YUZU_QT_WIDGETS
+    return QFileDialog::getSaveFileName((QWidget *) rootObject, title, dir, filter, selectedFilter, options);
+#endif
+}
+
 } // namespace QtCommon::Frontend