Add the Qt window module as an alternative to the SDL2 module

Att the Qt window module as an alternative to the SDL2 module

Description is TBD

src/module/qt_window/mainwindow.cc

@@ -3,7 +3,7 @@
 MainWindow::MainWindow(struct module_qt_window_s *qt_window, QWidget *parent)
     : QMainWindow(parent)
 {
-    qt_window->mpv_widget = new MpvWidget(qt_window->queue, qt_window->db, this);
+    qt_window->mpv_widget = new MpvWidget(qt_window->queue, qt_window->db, qt_window->reg, this);
     connect(qt_window->mpv_widget, &MpvWidget::titleChanged, this, &MainWindow::updateWindowTitle);
     setCentralWidget(qt_window->mpv_widget);
     setFocusPolicy(Qt::StrongFocus);