[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/gui/gui.c

@@ -485,7 +485,7 @@ Gui* gui_alloc() {
 
     // Input
     gui->input_queue = furi_message_queue_alloc(8, sizeof(InputEvent));
-    gui->input_events = furi_record_open("input_events");
+    gui->input_events = furi_record_open(RECORD_INPUT_EVENTS);
 
     furi_check(gui->input_events);
     furi_pubsub_subscribe(gui->input_events, gui_input_events_callback, gui);
@@ -497,7 +497,7 @@ int32_t gui_srv(void* p) {
     UNUSED(p);
     Gui* gui = gui_alloc();
 
-    furi_record_create("gui", gui);
+    furi_record_create(RECORD_GUI, gui);
 
     while(1) {
         uint32_t flags =