Add fast forward option

src/qt/qt_mainwindow.cpp

@@ -65,6 +65,7 @@ extern int qt_nvr_save(void);
 #endif
 
 extern bool cpu_thread_running;
+extern bool fast_forward;
 };
 
 #include <QGuiApplication>
@@ -2135,6 +2136,12 @@ MainWindow::on_actionUpdate_mouse_every_CPU_frame_triggered()
     config_save();
 }
 
+void
+MainWindow::on_action_Fast_forward_triggered()
+{
+    fast_forward ^= 1;
+}
+
 void
 MainWindow::on_actionRemember_size_and_position_triggered()
 {