Add qmodmaster and move udp app to applications

Applications/Qt-application_for_UDP_broadcast/about.h

@@ -0,0 +1,22 @@
+#ifndef ABOUT_H
+#define ABOUT_H
+
+#include <QDialog>
+
+namespace Ui {
+class About;
+}
+
+class About : public QDialog
+{
+    Q_OBJECT
+
+public:
+    explicit About(QWidget *parent = nullptr);
+    ~About();
+
+private:
+    Ui::About *ui;
+};
+
+#endif // ABOUT_H