Add support for Magnet links using Aria2

[e-alfred]

Aria2 can support this, see:

https://aria2.github.io/manual/en/html/aria2c.html#download-using-bittorrent-magnet-uri

[Nibbels]

I saw those type of links the first time in my life today. And didnt know what to do with them.
Bittorrent did not really matter in my previous live. ^^

As I read that is just a link that is an alternative to uploading .torrents.
Nice!

[DJCrashdummy]

it seems that magnet links where on the list a long time ago: https://github.com/DjazzLab/ocdownloader/issues/17 😉

[e-alfred]

@castorinop implemented this in a PR, but it is not merged yet: #48

[programagor]

Any idea when it is going to be merged into master? As it is right now, the BitTorrent portion is unusable for me without this feature.

[ThisIsQasim]

Same here. Would love to see the PR merged.

[e-alfred]

Fixed by fd40e03. Thanks @JasonPoon-cn!

[LukaPitamic]

@e-alfred how to implement magnet links being consumed by ocDownloader? I'm new to NC so sorry if the question is dumb. Also how to update NC App?