Bittorrent v2 support

[WhyNoobMaster69IsNotAvailable]

Any chance to support bittorrent v2 protocol?

[rndusr]

Probably not. The current code is too fragile. I would like to rip out a lot of fancy-but-mostly-useless features to make torf more maintable again, but that's basically a rewrite and I don't know when I will have the time. Possibly never.