Integrate GS1 Syntax Engine

frontend_qt/mainwindow.h

@@ -216,6 +216,7 @@ private:
     QGraphicsScene *scene;
     int m_symbology;
     QMenu *m_menu;
+    QCheckBox *m_chkGS1SyntaxEngine;
     QShortcut *m_saveAsShortcut;
     QShortcut *m_factoryResetShortcut;
     QShortcut *m_openCLIShortcut;