[FL-2627] Flipper applications: SDK, build and debug system (#1387)

* Added support for running applications from SD card (FAPs - Flipper Application Packages)
* Added plugin_dist target for fbt to build FAPs
* All apps of type FlipperAppType.EXTERNAL and FlipperAppType.PLUGIN are built as FAPs by default
* Updated VSCode configuration for new fbt features - re-deploy stock configuration to use them
* Added debugging support for FAPs with fbt debug & VSCode
* Added public firmware API with automated versioning

Co-authored-by: hedger <hedger@users.noreply.github.com>
Co-authored-by: SG <who.just.the.doctor@gmail.com>
Co-authored-by: あく <alleteam@gmail.com>

applications/main/u2f/u2f_app_i.h

@@ -0,0 +1,61 @@
+#pragma once
+
+#include "u2f_app.h"
+#include "scenes/u2f_scene.h"
+
+#include <gui/gui.h>
+#include <gui/view_dispatcher.h>
+#include <gui/scene_manager.h>
+#include <gui/modules/submenu.h>
+#include <dialogs/dialogs.h>
+#include <notification/notification_messages.h>
+#include <gui/modules/variable_item_list.h>
+#include <gui/modules/widget.h>
+#include "views/u2f_view.h"
+#include "u2f_hid.h"
+#include "u2f.h"
+
+typedef enum {
+    U2fAppErrorNoFiles,
+    U2fAppErrorCloseRpc,
+} U2fAppError;
+
+typedef enum {
+    U2fCustomEventNone,
+
+    U2fCustomEventConnect,
+    U2fCustomEventDisconnect,
+    U2fCustomEventDataError,
+
+    U2fCustomEventRegister,
+    U2fCustomEventAuth,
+    U2fCustomEventAuthSuccess,
+    U2fCustomEventWink,
+
+    U2fCustomEventTimeout,
+
+    U2fCustomEventConfirm,
+
+    U2fCustomEventErrorBack,
+
+} GpioCustomEvent;
+
+typedef enum {
+    U2fAppViewError,
+    U2fAppViewMain,
+} U2fAppView;
+
+struct U2fApp {
+    Gui* gui;
+    ViewDispatcher* view_dispatcher;
+    SceneManager* scene_manager;
+    NotificationApp* notifications;
+    Widget* widget;
+    FuriTimer* timer;
+    U2fHid* u2f_hid;
+    U2fView* u2f_view;
+    U2fData* u2f_instance;
+    GpioCustomEvent event_cur;
+    bool u2f_ready;
+    U2fAppError error;
+};