Undernet IRC Server Development

This is a bug that allows people to join channels that seem to be like
another channel for example.
If you enter in the channel name and then in xchat in linux hit
ctrl+shift+u then enter code feff hit enter then enter again to join the
channel you will see the problem. I join #darkbot then I join
#darkbotctrl+shift+ufeff. Then do a whois and you see.

Notice #darkbot and #darkbot.

* [juice-] (~juice@65.28.97.1): juice
* [juice-] #coder-com #darkbot #darkbot
* [juice-] SantaAna.CA.US.Undernet.org :Krypt Technologies Inc.
* [juice-] idle 00:00:37, signon: Sat Aug 15 14:10:45
* [juice-] End of WHOIS list.

This could confuse users when trying to join help channels or any channel
in general. It could be possible for malicious users to create rouge
channels that could trick users. The more advance users would spot this
trick but newer users might not. These characters aren't allowed in
nicknames so I think it would be wise to disallow them in #channelnames
also.

Freenode simply tells you it's an invalid channel.
* #darkbot :Illegal channel name

Or you could just have it disregard the special characters and have it take
the user to the intended channel.

Hopefully this makes sense. If not please ask me on Undernet. Nickname is
juice or juice_ Also talked with Vek in the channel so it made sense with
someone before posting this.

Thanks,
juice