[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/views/desktop_view_slideshow.c

@@ -5,6 +5,7 @@
 #include "../desktop_i.h"
 #include "desktop_view_slideshow.h"
 #include "../helpers/slideshow.h"
+#include "../helpers/slideshow_filename.h"
 
 struct DesktopSlideshowView {
     View* view;
@@ -60,7 +61,7 @@ static void desktop_view_slideshow_enter(void* context) {
 
     DesktopSlideshowViewModel* model = view_get_model(instance->view);
     model->slideshow = slideshow_alloc();
-    if(!slideshow_load(model->slideshow, "/int/slideshow")) {
+    if(!slideshow_load(model->slideshow, SLIDESHOW_FS_PATH)) {
         instance->callback(DesktopSlideshowCompleted, instance->context);
     }
     view_commit_model(instance->view, false);