msgproto: Support multi-byte command and response ids

Update the msgproto.py code so that it can support message ids that
are larger than a single byte.  (The host C code in
klippy/chelper/msgblock.c already supports multi-byte ids.)

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

klippy/mcu.py

@@ -87,7 +87,7 @@ class CommandWrapper:
         if cmd_queue is None:
             cmd_queue = serial.get_default_command_queue()
         self._cmd_queue = cmd_queue
-        self._msgtag = msgparser.lookup_msgtag(msgformat) & 0xffffffff
+        self._msgtag = msgparser.lookup_msgid(msgformat) & 0xffffffff
     def send(self, data=(), minclock=0, reqclock=0):
         cmd = self._cmd.encode(data)
         self._serial.raw_send(cmd, minclock, reqclock, self._cmd_queue)