Feature request: support for SASL authentication / CAP

[takikawa]

As specified here:

http://ircv3.net/specs/extensions/sasl-3.1.html
http://ircv3.net/specs/core/capability-negotiation-3.1.html

(Freenode has SASL authentication so it would be useful there.)

[schuster]

Sounds useful. I likely won't get to this anytime soon, but PRs are of course welcome ;-)

[offby1]

Just in case nobody noticed -- Racket 6.12 now has built-in SASL support.