On some IRC networks, users have vanity host masks with colors or other text styling.
Rizon is one such network.
For example, a user connecting from 127.0.0.1 could instead have the host
angerson@this.is.my.host.mask. this.is.my.host.mask may have IRC color code
characters in it, which without this change would be displayed as a bunch of jumbled
garbage in the /whois response or join/part messages.
Resolves#4232.
4d310cd545