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

@@ -7,4 +7,15 @@ MainWindow::MainWindow(struct module_qt_window_s *qt_window, QWidget *parent)
     connect(qt_window->mpv_widget, &MpvWidget::titleChanged, this, &MainWindow::updateWindowTitle);
     setCentralWidget(qt_window->mpv_widget);
     setFocusPolicy(Qt::StrongFocus);
+
+    connect(this, &MainWindow::emitCloseMpv, this, &MainWindow::__closeMpv, Qt::QueuedConnection);
+}
+
+void MainWindow::closeMpv(bool* exited) noexcept {
+    emit emitCloseMpv(exited);
+}
+
+void MainWindow::__closeMpv(bool* exited){
+    delete centralWidget();
+    *exited = true;
 }