Correct RFUDEBUG and add QRFDEBUG packet

Small PR to correct an typo with RFUDEBUG and add the QRFDEBUG 'protocol'.

Maybe also PING protocol can be added here.

May it be necessary to control the response in the `decode_packet` function?

rflink/parser.py

@@ -308,7 +308,9 @@ def encode_packet(packet: dict) -> str:
     if packet['protocol'] == 'rfdebug':
         return '10;RFDEBUG=' + packet['command'] + ';'
     elif packet['protocol'] == 'rfudebug':
-        return '10;RFDEBUG=' + packet['command'] + ';'
+        return '10;RFUDEBUG=' + packet['command'] + ';'
+    elif packet['protocol'] == 'qrfdebug':
+        return '10;QRFDEBUG=' + packet['command'] + ';'
     else:
         return SWITCH_COMMAND_TEMPLATE.format(
             node=PacketHeader.master.value,