Mark specific IRCds as deprecated?

[DanielOaks]

IRCds that haven't been updated in ages and which are not used in the real world should have their numerics marked as 'obsolete' if they are not used by other IRCds, imo. This is a list of IRCds which I'm thinking about marking obsolete, and would like some comments and thoughts on:

• Ithildin: hasn't been updated in quite a while, and I can't see it used anywhere.

[DanielOaks]

very rough initial targets: hasn't had any commits in 2-3 years, not in production use on any network with over 500 users

if a server fails both those, I'd probably obsolete its' special numerics without a big drama. if we do make any obsoletions based on server, splitting them up into separate PRs would be very nice if possible