Add Open ROM inside Archive function

instead of using file extensions

src/frontend/qt_sdl/main.h

@@ -191,6 +191,7 @@ signals:
 
 private slots:
     void onOpenFile();
+    void onOpenFileArchive();
     void onClickRecentFile();
     void onClearRecentFiles();
     void onBootFirmware();
@@ -251,6 +252,7 @@ public:
     QWidget* panel;
 
     QAction* actOpenROM;
+    QAction* actOpenROMArchive;
     QAction* actBootFirmware;
     QAction* actSaveState[9];
     QAction* actLoadState[9];