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_dispatcher.h

@@ -0,0 +1,45 @@
+#pragma once
+
+#include "view.h"
+#include "gui.h"
+
+/* ViewDispatcher widget placement */
+typedef enum {
+    ViewDispatcherTypeNone, /* Special layer for internal use only */
+    ViewDispatcherTypeWindow, /* Main widget layer, status bar is shown */
+    ViewDispatcherTypeFullscreen /* Fullscreen widget layer */
+} ViewDispatcherType;
+
+typedef struct ViewDispatcher ViewDispatcher;
+
+/* Allocate ViewDispatcher
+ * @return pointer to ViewDispatcher instance
+ */
+ViewDispatcher* view_dispatcher_alloc();
+
+/* Free ViewDispatcher
+ * @param pointer to View
+ */
+void view_dispatcher_free(ViewDispatcher* view_dispatcher);
+
+/* Add view to ViewDispatcher
+ * @param view_dispatcher, ViewDispatcher instance
+ * @param view_id, View id to register
+ * @param view, View instance
+ */
+void view_dispatcher_add_view(ViewDispatcher* view_dispatcher, uint32_t view_id, View* view);
+
+/* Switch to View
+ * @param view_dispatcher, ViewDispatcher instance
+ * @param view_id, View id to register
+ */
+void view_dispatcher_switch_to_view(ViewDispatcher* view_dispatcher, uint32_t view_id);
+
+/* Attach ViewDispatcher to GUI
+ * @param view_dispatcher, ViewDispatcher instance
+ * @param gui, GUI instance to attach to
+ */
+void view_dispatcher_attach_to_gui(
+    ViewDispatcher* view_dispatcher,
+    Gui* gui,
+    ViewDispatcherType type);