[FL-1371] New LF-RFID app. Second encounter. (#547)

* File worker: file operations helper.
* Notification app: removed yield
* File worker: write operations, calls to system file widgets
* App ibutton: use file worker
* Lfrfid: generic key loading, add path helper and hex conversion to lib
* FileWorker: plain C verison
* FileWorker: add to lib.mk
* FileWorker: add to C sources, instead of CPP
* Lfrfid: save scene
* App lfrfid: add key scene, saved key menu
* App lfrfid: saved key info scene
* App lfrfid: delete key scene

applications/lfrfid/lfrfid-app-launcher.cpp

@@ -1,9 +1,9 @@
 #include "lfrfid-app.h"
 
 // app enter function
-extern "C" int32_t lfrfid_app(void* p) {
+extern "C" int32_t lfrfid_app(void* args) {
     LfRfidApp* app = new LfRfidApp();
-    app->run();
+    app->run(args);
     delete app;
 
     return 0;