This introduces an up to 10 second delay if a SIGINT is received just after changing the config. I can't be bothered to integrate this with Storage.run and overly complicate things.

Per RFC 7235, the realm value can be a quoted-string. That's defined in RFC 7230 and can contain HTAB or SP and up except for the double quote, backslash, or DEL. (Double quote and backslash could be escaped by backslash, but I won't bother with implementing that until it's needed.)

IRCClientProtocol.channels gets updated on the KICK, so it will naturally appear in channelsToJoin (as long as it's still in the config).