[FL-1059] T5577 write (#463)

* Api-hal-gpio: extend init functions
* App Lfrfid: separate protocol layer
* App Lfrfid: write EM key scene
* App Lfrfid: syntax fix

applications/lf-rfid/scene/lf-rfid-scene-write.h

@@ -0,0 +1,14 @@
+#pragma once
+#include "lf-rfid-scene-generic.h"
+#include "../helpers/key-info.h"
+#include "../helpers/rfid-writer.h"
+
+class LfrfidSceneWrite : public LfrfidScene {
+public:
+    void on_enter(LfrfidApp* app) final;
+    bool on_event(LfrfidApp* app, LfrfidEvent* event) final;
+    void on_exit(LfrfidApp* app) final;
+
+private:
+    uint8_t timing_index;
+};