[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/music_player/music_player_worker.h

@@ -0,0 +1,36 @@
+#pragma once
+
+#include <stdbool.h>
+#include <stdint.h>
+
+typedef void (*MusicPlayerWorkerCallback)(
+    uint8_t semitone,
+    uint8_t dots,
+    uint8_t duration,
+    float position,
+    void* context);
+
+typedef struct MusicPlayerWorker MusicPlayerWorker;
+
+MusicPlayerWorker* music_player_worker_alloc();
+
+void music_player_worker_free(MusicPlayerWorker* instance);
+
+bool music_player_worker_load(MusicPlayerWorker* instance, const char* file_path);
+
+bool music_player_worker_load_fmf_from_file(MusicPlayerWorker* instance, const char* file_path);
+
+bool music_player_worker_load_rtttl_from_file(MusicPlayerWorker* instance, const char* file_path);
+
+bool music_player_worker_load_rtttl_from_string(MusicPlayerWorker* instance, const char* string);
+
+void music_player_worker_set_callback(
+    MusicPlayerWorker* instance,
+    MusicPlayerWorkerCallback callback,
+    void* context);
+
+void music_player_worker_set_volume(MusicPlayerWorker* instance, float volume);
+
+void music_player_worker_start(MusicPlayerWorker* instance);
+
+void music_player_worker_stop(MusicPlayerWorker* instance);