[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/debug/battery_test_app/battery_test_app.h

@@ -0,0 +1,25 @@
+#include <furi.h>
+#include <power/power_service/power.h>
+#include <gui/gui.h>
+#include <gui/view.h>
+#include <gui/view_dispatcher.h>
+#include <notification/notification.h>
+
+#include <gui/modules/dialog_ex.h>
+// FIXME
+#include "../settings/power_settings_app/views/battery_info.h"
+
+typedef struct {
+    Power* power;
+    Gui* gui;
+    NotificationApp* notifications;
+    ViewDispatcher* view_dispatcher;
+    BatteryInfo* battery_info;
+    DialogEx* dialog;
+    PowerInfo info;
+} BatteryTestApp;
+
+typedef enum {
+    BatteryTestAppViewBatteryInfo,
+    BatteryTestAppViewExitDialog,
+} BatteryTestAppView;