No more /nick command, no more #who on Discord

[Rias]

A user is now required to be logged into an account in order to use the chat/ooc commands, so the /nick command is no more.

After listening to some concerns, I've disabled the #who channel on Discord. Presumably, people who want their presence to be known outside the game will chat to announce their presence. The #who channel still works in-game at the moment, and I plan to program the Discord bot to be able to respond to direct /who queries.