add signal prototypes

src/main.cpp

@@ -79,17 +79,6 @@ using namespace Qt::Literals::StringLiterals;
 int main(int argc, char *argv[])
 {
 
-  /*
-
-   // Signal für einzelne QStandardItem-Änderungen
-connect(model, &QStandardItemModel::itemChanged,
-        this, [](QStandardItem *changedItem){
-    QVariant state = changedItem->data(Qt::CheckStateRole);
-    qDebug() << "Neuer Check-State:" << state.toInt();
-});
-  */
-
-
   QApplication app(argc, argv);
   //app.setStyle("fusion");
   XQMainWindow window;