New LF-RFID app (#534)

* Hal lfrfid: add read timer pulse and period config fns
* New debug application for lfrfid subsystem
* New lfrfid: app, fix naming
* App lfrfid: assets
* Container view module
* App ibutton: remove unused header
* App lfrfid scenes
* App notification, add yield to blocking operations, add speaker volume control
* App lfrfid: reading key scene
* Assets: placeholder icon
* App lfrfid: reworked container view module
* App lfrfid: new scenes
* App lfrfid: write scene
* App lfrfid: write hid
* App lfrfid: emulate scene
* App lfrfid: save name scene
* App lfrfid: add missing file

lib/app-scened-template/file-worker.h

@@ -0,0 +1,27 @@
+#pragma once
+#include "record-controller.hpp"
+#include <sd-card-api.h>
+#include <filesystem-api.h>
+#include <m-string.h>
+
+class FileWorker {
+public:
+    FileWorker();
+    ~FileWorker();
+
+    RecordController<FS_Api> fs_api;
+    RecordController<SdCard_Api> sd_ex_api;
+
+    bool open(const char* filename, FS_AccessMode access_mode, FS_OpenMode open_mode);
+    bool close();
+
+    bool mkdir(const char* dirname);
+    bool remove(const char* filename);
+
+private:
+    File file;
+
+    bool check_common_errors();
+    void show_error_message(const char* error_text);
+    string_t error_string;
+};