[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/system/updater/util/update_task_i.h

@@ -0,0 +1,26 @@
+#pragma once
+
+#include <storage/storage.h>
+#include <furi_hal.h>
+
+#define UPDATE_TASK_NOERR 0
+#define UPDATE_TASK_FAILED -1
+
+typedef struct UpdateTask {
+    UpdateTaskState state;
+    string_t update_path;
+    UpdateManifest* manifest;
+    FuriThread* thread;
+    Storage* storage;
+    File* file;
+    updateProgressCb status_change_cb;
+    void* status_change_cb_state;
+    FuriHalRtcBootMode boot_mode;
+} UpdateTask;
+
+void update_task_set_progress(UpdateTask* update_task, UpdateTaskStage stage, uint8_t progress);
+bool update_task_parse_manifest(UpdateTask* update_task);
+bool update_task_open_file(UpdateTask* update_task, string_t filename);
+
+int32_t update_task_worker_flash_writer(void* context);
+int32_t update_task_worker_backup_restore(void* context);