Start of a caching web client thingie

In support of feature request 86.
Now, there's no immediate plan for what 86 is actually asking for,
but being able to point to things like the Synchronet BBS List and
having them automatically show up in your dialing directory would
be pretty nice.

Actually doing 86 means being able to merge lists, which I'm not
sure I want to deal with at this time.