Twitter search channels

One of the most interesting patches in the bitlbee tracker, still unreviewed i believe, but a bunch of people are using it so it works at least.
Anyway I'd rather have a more general search system. Hashtags always seemed like "highlighted words" and not much else to me. But otherwise I think we can agree this patch is great 10/10 would apply why do I even put it here for review if these PRs are supposed to be for my shit code, not for the code of other people. Whatever.