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>

lib/update_util/update_operation.h

@@ -1,7 +1,6 @@
 #pragma once
 
 #include <stdbool.h>
-#include <m-string.h>
 #include <storage/storage.h>
 
 #ifdef __cplusplus
@@ -19,7 +18,7 @@ extern "C" {
  *   May be empty if update is in root update directory
  * @return bool if supplied path is valid and out_manifest_dir contains dir to apply
  */
-bool update_operation_get_package_dir_name(const char* full_path, string_t out_manifest_dir);
+bool update_operation_get_package_dir_name(const char* full_path, FuriString* out_manifest_dir);
 
 /* When updating this enum, also update assets/protobuf/system.proto */
 typedef enum {
@@ -51,7 +50,7 @@ UpdatePrepareResult update_operation_prepare(const char* manifest_file_path);
  * @param out_path Path to manifest. Must be initialized
  * @return true if path was restored successfully
  */
-bool update_operation_get_current_package_manifest_path(Storage* storage, string_t out_path);
+bool update_operation_get_current_package_manifest_path(Storage* storage, FuriString* out_path);
 
 /* 
  * Checks if an update operation step is pending after reset