[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/settings/bt_settings_app/bt_settings_app.h

@@ -0,0 +1,41 @@
+#pragma once
+
+#include <furi.h>
+#include <bt/bt_service/bt.h>
+#include <gui/gui.h>
+#include <gui/view.h>
+#include <gui/view_dispatcher.h>
+#include <gui/scene_manager.h>
+
+#include <gui/modules/variable_item_list.h>
+#include <gui/modules/dialog_ex.h>
+#include <gui/modules/popup.h>
+
+#include <bt/bt_settings.h>
+#include "scenes/bt_settings_scene.h"
+
+enum BtSettingsCustomEvent {
+    // Keep first 10 events reserved for button types and indexes
+    BtSettingsCustomEventReserved = 10,
+
+    BtSettingsCustomEventForgetDevices,
+    BtSettingsCustomEventExitView,
+};
+
+typedef struct {
+    BtSettings settings;
+    Bt* bt;
+    Gui* gui;
+    SceneManager* scene_manager;
+    ViewDispatcher* view_dispatcher;
+
+    VariableItemList* var_item_list;
+    DialogEx* dialog;
+    Popup* popup;
+} BtSettingsApp;
+
+typedef enum {
+    BtSettingsAppViewVarItemList,
+    BtSettingsAppViewDialog,
+    BtSettingsAppViewPopup,
+} BtSettingsAppView;