Accessibility over serial (#1717)

* Initial accessibility support
* added it to some widgets to test
* More widget accessibility response
* More widgets, better output
* Mark selected widget on list
* typo

firmware/application/event_m0.hpp

@@ -89,6 +89,9 @@ class EventDispatcher {
     void emulateTouch(ui::TouchEvent event);
     void emulateKeyboard(ui::KeyboardEvent event);
 
+    ui::Widget* getTopWidget();
+    ui::Widget* getFocusedWidget();
+
    private:
     static Thread* thread_event_loop;