[FL-835] Factory reset. Cli refactoring. (#466)

* ApiHal: add boot flags. Internal storage: add factory reset.
* Bootloader: correct doxygen comment format.
* Cli: change cli callback signature. Applications: update API usage. Add factory_reset cli command.

applications/gui/gui.c

@@ -213,7 +213,7 @@ void gui_cli_screen_stream_callback(uint8_t* data, size_t size, void* context) {
     cli_write(gui->cli, data, size);
 }
 
-void gui_cli_screen_stream(string_t args, void* context) {
+void gui_cli_screen_stream(Cli* cli, string_t args, void* context) {
     furi_assert(context);
     Gui* gui = context;
     gui_set_framebuffer_callback_context(gui, gui);