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/view_i.h

@@ -0,0 +1,36 @@
+#pragma once
+
+#include "view.h"
+#include "view_dispatcher_i.h"
+#include <flipper_v2.h>
+
+typedef struct {
+    void* data;
+    osMutexId_t mutex;
+} ViewModelLocking;
+
+struct View {
+    ViewDispatcher* dispatcher;
+    ViewDrawCallback draw_callback;
+    ViewInputCallback input_callback;
+    ViewModelType model_type;
+    ViewNavigationCallback previous_callback;
+    ViewNavigationCallback next_callback;
+    void* model;
+    void* context;
+};
+
+/* Set View dispatcher */
+void view_set_dispatcher(View* view, ViewDispatcher* view_dispatcher);
+
+/* Draw Callback for View dispatcher */
+void view_draw(View* view, Canvas* canvas);
+
+/* Input Callback for View dispatcher */
+bool view_input(View* view, InputEvent* event);
+
+/* Previous Callback for View dispatcher */
+uint32_t view_previous(View* view);
+
+/* Next Callback for View dispatcher */
+uint32_t view_next(View* view);