[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/settings/system/system_settings.h

@@ -0,0 +1,18 @@
+#pragma once
+
+#include <furi.h>
+#include <furi_hal.h>
+
+#include <gui/gui.h>
+#include <gui/view_dispatcher.h>
+#include <gui/modules/variable_item_list.h>
+
+typedef struct {
+    Gui* gui;
+    ViewDispatcher* view_dispatcher;
+    VariableItemList* var_item_list;
+} SystemSettings;
+
+typedef enum {
+    SystemSettingsViewVarItemList,
+} SystemSettingsView;