Disable debug output by default

QTProject/main.cpp

 #include "mainwindow.h"
 #include <QApplication>
+#include <QLoggingCategory>
 
 int main(int argc, char *argv[])
 {
     QApplication a(argc, argv);
+    QLoggingCategory::setFilterRules("*.debug=false");
+
     MainWindow w;
     w.show();