[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/helpers/rfid-writer.h

@@ -0,0 +1,17 @@
+#pragma once
+#include "stdint.h"
+
+class RfidWriter {
+public:
+    RfidWriter();
+    ~RfidWriter();
+    void start();
+    void stop();
+    void write_em(uint8_t em_data[5]);
+
+private:
+    void write_gap(uint32_t gap_time);
+    void write_bit(bool value);
+    void write_byte(uint8_t value);
+    void write_block(uint8_t page, uint8_t block, bool lock_bit, uint32_t data);
+};