Show torrent magnetURI when seeding

[Stiveknx]

From issue #404.

[whitef0x0]

Is there any reason this wasn't merged @feross?

[feross]

Yeah, sorry for not merging this earlier. This looks like it doesn't merge cleanly anymore.

The other issue with it (and it's not the PR's fault) is that it'll break the clivas package because magnet uris will almost always be longer than the terminal width and the package can't handle rendering that.

I think a better solution is to pause with the uri visible on the screen with a "Press ENTER to start seeding." message. This gives the user the chance to copy the uri before the terminal GUI takes over.

[lock]

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