[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/modules/empty_screen.c

@@ -0,0 +1,37 @@
+#include "empty_screen.h"
+#include <furi.h>
+
+struct EmptyScreen {
+    View* view;
+};
+
+static void empty_screen_view_draw_callback(Canvas* canvas, void* _model) {
+    UNUSED(_model);
+    canvas_clear(canvas);
+}
+
+static bool empty_screen_view_input_callback(InputEvent* event, void* context) {
+    UNUSED(event);
+    UNUSED(context);
+    return false;
+}
+
+EmptyScreen* empty_screen_alloc() {
+    EmptyScreen* empty_screen = malloc(sizeof(EmptyScreen));
+    empty_screen->view = view_alloc();
+    view_set_context(empty_screen->view, empty_screen);
+    view_set_draw_callback(empty_screen->view, empty_screen_view_draw_callback);
+    view_set_input_callback(empty_screen->view, empty_screen_view_input_callback);
+    return empty_screen;
+}
+
+void empty_screen_free(EmptyScreen* empty_screen) {
+    furi_assert(empty_screen);
+    view_free(empty_screen->view);
+    free(empty_screen);
+}
+
+View* empty_screen_get_view(EmptyScreen* empty_screen) {
+    furi_assert(empty_screen);
+    return empty_screen->view;
+}