Login doesn't work

[jackuoll]

Python 3.8.5, twisted 21.2.0, twisted installed in virtualenv

2021-04-30 18:48:37,971 -   File "/home/jack/projects/GemUO/src/gemuo/client.py", line 160, in on_connect
2021-04-30 18:48:37,971 -     e = AccountLogin(client, username, password, character, connect).deferred
2021-04-30 18:48:37,972 -   File "/home/jack/projects/GemUO/src/gemuo/client.py", line 127, in __init__
2021-04-30 18:48:37,972 -     client.send(p.AccountLogin(username, password))
2021-04-30 18:48:37,972 -   File "/home/jack/projects/GemUO/src/gemuo/client.py", line 84, in send
2021-04-30 18:48:37,972 -     self._client.send(data)
2021-04-30 18:48:37,973 -   File "/home/jack/projects/GemUO/src/uo/client.py", line 81, in send
2021-04-30 18:48:37,973 -     self.transport.write(data)
2021-04-30 18:48:37,974 -   File "/home/jack/.virtualenvs/gemuo/lib/python3.8/site-packages/twisted/internet/abstract.py", line 355, in write
2021-04-30 18:48:37,974 -     _dataMustBeBytes(data)
2021-04-30 18:48:37,975 -   File "/home/jack/.virtualenvs/gemuo/lib/python3.8/site-packages/twisted/internet/abstract.py", line 23, in _dataMustBeBytes
2021-04-30 18:48:37,975 -     raise TypeError("Data must be bytes")
2021-04-30 18:48:37,975 - builtins.TypeError: Data must be bytes

The result of the packet.finish() is returning a bytearray in this case and not bytes. Simplest solution (though I have no idea if there are any caveats) is to simply add to the return value of packet.finish()

        if isinstance(data, bytearray):
            return bytes(data)
        return data

This seems to work without issue, but I haven't really begun to look into much else except your example of running GemUO with the hiding script. Also had a fix a syntax error in src/gemuo/engine/training.py on line 255 in the on_system_message method.

I may make a PR later, still just having a gander at the project and considering if I can get much use out of it.