App launcher button

        // Hook to the event to add my button
        public override void OnAwake()
        {
            GameEvents.onGUIApplicationLauncherReady.Add(OnGUIAppLauncherReady);
        }


    // Add the button to the toolbar
        void OnGUIAppLauncherReady()
        {
            if (ApplicationLauncher.Ready)
            {
                Debug.Log("About to add the app button...");

                Texture btnTex = GameDatabase.Instance.GetTexture("DangIt/Textures/appBtn", false);

                appBtn = ApplicationLauncher.Instance.AddModApplication(
                            onAppBtnToggleOn,
                            onAppBtnToggleOff,
                            dummyVoid,
                            dummyVoid,
                            dummyVoid,
                            dummyVoid,
                            ApplicationLauncher.AppScenes.SPACECENTER,
                            btnTex);
            }
        }


    // Enable the GUI
        void onAppBtnToggleOn()
        {
            newSettings = this.currentSettings.ShallowClone();
            this.showGUI = true;
        }


    // Disable the GUI
        void onAppBtnToggleOff()
        {
            newSettings = null;
            this.showGUI = false;
        }


    // Nothing
        void dummyVoid()
        {
            return;
        }

    // Draw the window when enabled
        void OnGUI()
        {
            if (showGUI)
            {
                GUI.skin = HighLogic.Skin;
                windowRect = GUILayout.Window(0, windowRect, WindowFunction, "DangIt! Settings");
            }
        }