[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/services/loader/loader.h

@@ -0,0 +1,59 @@
+#pragma once
+
+#include <core/pubsub.h>
+#include <stdbool.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define RECORD_LOADER "loader"
+
+typedef struct Loader Loader;
+
+typedef enum {
+    LoaderStatusOk,
+    LoaderStatusErrorAppStarted,
+    LoaderStatusErrorUnknownApp,
+    LoaderStatusErrorInternal,
+} LoaderStatus;
+
+typedef enum {
+    LoaderEventTypeApplicationStarted,
+    LoaderEventTypeApplicationStopped
+} LoaderEventType;
+
+typedef struct {
+    LoaderEventType type;
+} LoaderEvent;
+
+/** Start application
+ * @param name - application name
+ * @param args - application arguments
+ * @retval true on success
+ */
+LoaderStatus loader_start(Loader* instance, const char* name, const char* args);
+
+/** Lock application start
+ * @retval true on success
+ */
+bool loader_lock(Loader* instance);
+
+/** Unlock application start */
+void loader_unlock(Loader* instance);
+
+/** Get loader lock status */
+bool loader_is_locked(Loader* instance);
+
+/** Show primary loader */
+void loader_show_menu();
+
+/** Show primary loader */
+void loader_update_menu();
+
+/** Show primary loader */
+FuriPubSub* loader_get_pubsub(Loader* instance);
+
+#ifdef __cplusplus
+}
+#endif