Do RFID scans only at specified intervals. System sounds are now supported, as well as more sound formats (.ogg, .mp4...).

include/controller.h

@@ -12,6 +12,7 @@ private:
 	void _check_rfid();
 	void _check_serial();
 	Player* _player;
+	unsigned long _last_rfid_scan_at = 0;
 public:
 	Controller(Player* p);
 	void loop();