[Kget] KGet2 bittorrent plugin developement

[Joris Guisson]

The way I see it,if we were to use libktorrent as a separate shared
library, users would probably run into problems somewhere with
incompatable versions of the plugin with libktorrent or libktorrent
with KT.

So a stripped down version of a stable snapshot of libktorrent static
linked with the plugin, seems better. We do not need to worry about
incompatabilities, users do not need to install a library or KT to get
a working bittorrent plugin.