Rqbit v5.0.0-beta.0 with TCP listening (proper upload support)

Major feature: TCP listening on external ports

By default, rqbit now listens on ports 4240-4260, publishes those ports over Upnp (which exposes them on your router for port forwarding from the external world), and announces itself over DHT.
This means that external world might connect to it (if forwarding worked properly).

This change was influenced by a comment on Hacker news.

If you don't like this, turn off with --disable-tcp-listen and/or --disable-upnp.
If you think some of it shouldn't be default, please comment on #42.

What's Changed

• Listen on TCP and publish ports over Upnp by @ikatson in #42

Full Changelog: v4.0.0...v5.0.0-beta.0