Replace Ktorrent with a more functional torrent client

[Afiefh]

Hello,

Ktorrent hasn't had a new release in two years, the last real commit to the ktorrent repository was on 2014-12-19 and to the libktorrent repository on 2014-05-28. It doesn't work out of the box (trouble accepting magnet links from chrome/chromium) and other issues.

There are other clients that provide a more streamlined experience and are more actively developed such as Qbittorrent (similar GUI to Ktorrent) and Qtransmission both of which don't suffer from KTorrent's issues.

Thanks