Pre-RC Bug Fixes and Gui lockdown mode. (#973)

* Rfid: fix incorrect StringElement parameters
* Gui, Desktop: add lockdown mode, integrate with desktop.
* Gui: fix runglish in doxy

applications/gui/gui.h

@@ -79,6 +79,16 @@ void gui_view_port_send_to_back(Gui* gui, ViewPort* view_port);
  */
 void gui_set_framebuffer_callback(Gui* gui, GuiCanvasCommitCallback callback, void* context);
 
+/** Set lockdown mode
+ *
+ * When lockdown mode is enabled, only GuiLayerDesktop is shown.
+ * This feature prevents services from showing sensitive information when flipper is locked.
+ *
+ * @param      gui       Gui instance
+ * @param      lockdown  bool, true if enabled
+ */
+void gui_set_lockdown(Gui* gui, bool lockdown);
+
 #ifdef __cplusplus
 }
 #endif