[FL-2675] /int space reservation (#1448)

* storage: added global #defines for /int, /ext & /any
* storage: introduced PATH_EXT, PATH_INT& PATH_ANY macros
* core apps: moved hardcoded config files names to separate headers; prefixed them with "."; updater: added file name migration to new naming convention on backup extraction
* storage: fixed storage_merge_recursive handling of complex directory structures; storage_move_to_sd: changed data migration logic to all non-dot files & all folders
* core: added macro aliases for core record names
* Bumped protobuf commit pointer
* storage: reserved 5 pages in /int; denying write&creation of non-dot files when running out of free space

Co-authored-by: あく <alleteam@gmail.com>

applications/desktop/scenes/desktop_scene_locked.c

@@ -47,9 +47,9 @@ void desktop_scene_locked_on_enter(void* context) {
     if(state == SCENE_LOCKED_FIRST_ENTER) {
         bool pin_locked = desktop_pin_lock_is_locked();
         view_port_enabled_set(desktop->lock_viewport, true);
-        Gui* gui = furi_record_open("gui");
+        Gui* gui = furi_record_open(RECORD_GUI);
         gui_set_lockdown(gui, true);
-        furi_record_close("gui");
+        furi_record_close(RECORD_GUI);
 
         if(pin_locked) {
             LOAD_DESKTOP_SETTINGS(&desktop->settings);