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/gui/elements.h

@@ -9,7 +9,7 @@
 #pragma once
 
 #include <stdint.h>
-#include <m-string.h>
+#include <furi.h>
 #include "canvas.h"
 
 #ifdef __cplusplus
@@ -190,7 +190,7 @@ void elements_bubble_str(
  * @param   string  string to trim
  * @param   width   max width
  */
-void elements_string_fit_width(Canvas* canvas, string_t string, uint8_t width);
+void elements_string_fit_width(Canvas* canvas, FuriString* string, uint8_t width);
 
 /** Draw text box element
  *