M*LIB: non-inlined strings, FuriString primitive (#1795)

* Quicksave 1
* Header stage complete
* Source stage complete
* Lint & merge fixes
* Includes
* Documentation step 1
* FBT: output free size considering BT STACK
* Documentation step 2
* py lint
* Fix music player plugin
* unit test stage 1: string allocator, mem, getters, setters, appends, compare, search.
* unit test: string equality
* unit test: string replace
* unit test: string start_with, end_with
* unit test: string trim
* unit test: utf-8
* Rename
* Revert fw_size changes
* Simplify CLI backspace handling
* Simplify CLI character insert
* Merge fixes
* Furi: correct filenaming and spelling
* Bt: remove furi string include

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

applications/services/storage/storage.h

@@ -1,6 +1,5 @@
 #pragma once
 #include <stdint.h>
-#include <m-string.h>
 #include "filesystem_api_defines.h"
 #include "storage_sd_api.h"
 
@@ -292,7 +291,7 @@ FS_Error storage_sd_status(Storage* api);
 
 /******************* Internal LFS Functions *******************/
 
-typedef void (*Storage_name_converter)(string_t);
+typedef void (*Storage_name_converter)(FuriString*);
 
 /** Backs up internal storage to a tar archive
  * @param api pointer to the api
@@ -350,7 +349,7 @@ void storage_get_next_filename(
     const char* dirname,
     const char* filename,
     const char* fileextension,
-    string_t nextfilename,
+    FuriString* nextfilename,
     uint8_t max_len);
 
 #ifdef __cplusplus