add lightbar color override to Controller GUI (#2443)

* WIP Lightbar GUI, needs saving and loading

* Implement saving and loading lightbar values

* replace license header deleted by QT

src/qt_gui/control_settings.h

@@ -18,6 +18,7 @@ public:
 private Q_SLOTS:
     void SaveControllerConfig(bool CloseOnSave);
     void SetDefault();
+    void UpdateLightbarColor();
 
 private:
     std::unique_ptr<Ui::ControlSettings> ui;