[FL-1791] Flipper file format (#740)

* Lib: new flipper file format library
* Lib: flipper file format cpp wrapper
* Storage: simple function for remove file and check error
* iButton app: remove file worker, use new flipper file format instead
* Dialogs: storage error message
* Storage: simple function for mkdir and check error
* iButton app: error messages
* Libs: update makefile
* RFID app: remove file worker, use new flipper file format instead
* Flipper File: library documentation

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

applications/storage/storage-external-api.c

@@ -380,4 +380,16 @@ void storage_file_free(File* file) {
     }
 
     free(file);
+}
+
+bool storage_simply_remove(Storage* storage, const char* path) {
+    FS_Error result;
+    result = storage_common_remove(storage, path);
+    return result == FSE_OK || result == FSE_NOT_EXIST;
+}
+
+bool storage_simply_mkdir(Storage* storage, const char* path) {
+    FS_Error result;
+    result = storage_common_mkdir(storage, path);
+    return result == FSE_OK || result == FSE_EXIST;
 }

applications/storage/storage.h

@@ -230,6 +230,24 @@ FS_Error storage_sd_info(Storage* api, SDInfo* info);
  */
 FS_Error storage_sd_status(Storage* api);
 
+/***************** Simplified Functions ******************/
+
+/**
+ * Removes a file/directory from the repository, the directory must be empty and the file/directory must not be open
+ * @param storage pointer to the api
+ * @param path 
+ * @return true on success or if file/dir is not exist
+ */
+bool storage_simply_remove(Storage* storage, const char* path);
+
+/**
+ * Creates a directory
+ * @param storage 
+ * @param path 
+ * @return true on success or if directory is already exist
+ */
+bool storage_simply_mkdir(Storage* storage, const char* path);
+
 #ifdef __cplusplus
 }
 #endif