FL-528 GUI: View, ViewDispather. Dolphin: first start. (#276)

* GUI: view. Flooper-blooper fix compilation error.
* GUI: view and viewdispatcher bones
* GUI: view implementation, view models, view dispatcher
* GUI: view navigation, model refinement. Power: use view, view dispatcher.
* HAL Flash: proper page write. Dolphin: views. Power: views
* Dolphin: transition idle scree to Views
* Dolphin: input events on stats view. Format sources.
* HAL: flash erase. Dolphin: permanent state storage.
* Dolphin: first start welcome. HAL: flash operation status, errata 2.2.9 crutch.

applications/gui/widget.h

@@ -9,7 +9,7 @@ typedef struct Widget Widget;
  * Widget Draw callback
  * @warning called from GUI thread
  */
-typedef void (*WidgetDrawCallback)(Canvas* api, void* context);
+typedef void (*WidgetDrawCallback)(Canvas* canvas, void* context);
 
 /*
  * Widget Input callback