[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/plugins/picopass/picopass_worker.h

@@ -0,0 +1,46 @@
+#pragma once
+
+#include "picopass_device.h"
+
+typedef struct PicopassWorker PicopassWorker;
+
+typedef enum {
+    // Init states
+    PicopassWorkerStateNone,
+    PicopassWorkerStateBroken,
+    PicopassWorkerStateReady,
+    // Main worker states
+    PicopassWorkerStateDetect,
+    PicopassWorkerStateWrite,
+    // Transition
+    PicopassWorkerStateStop,
+} PicopassWorkerState;
+
+typedef enum {
+    // Reserve first 50 events for application events
+    PicopassWorkerEventReserved = 50,
+
+    // Picopass worker common events
+    PicopassWorkerEventSuccess,
+    PicopassWorkerEventFail,
+    PicopassWorkerEventNoCardDetected,
+
+    PicopassWorkerEventStartReading,
+} PicopassWorkerEvent;
+
+typedef void (*PicopassWorkerCallback)(PicopassWorkerEvent event, void* context);
+
+PicopassWorker* picopass_worker_alloc();
+
+PicopassWorkerState picopass_worker_get_state(PicopassWorker* picopass_worker);
+
+void picopass_worker_free(PicopassWorker* picopass_worker);
+
+void picopass_worker_start(
+    PicopassWorker* picopass_worker,
+    PicopassWorkerState state,
+    PicopassDeviceData* dev_data,
+    PicopassWorkerCallback callback,
+    void* context);
+
+void picopass_worker_stop(PicopassWorker* picopass_worker);