[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/gui/scene_manager_i.h

@@ -0,0 +1,22 @@
+/**
+ * @file scene_manager_i.h
+ * GUI: internal SceneManager API
+ */
+
+#pragma once
+
+#include "scene_manager.h"
+#include <m-array.h>
+
+ARRAY_DEF(SceneManagerIdStack, uint32_t, M_DEFAULT_OPLIST);
+
+typedef struct {
+    uint32_t state;
+} AppScene;
+
+struct SceneManager {
+    SceneManagerIdStack_t scene_id_stack;
+    const SceneManagerHandlers* scene_handlers;
+    AppScene* scene;
+    void* context;
+};