over thier signal and slot code to normal method calls.  This code was pretty
ugly so this actually made things much more clear.

Also this required coming up with a more self contained MusicBrainz confirmation
process, so that's now been moved into MusicBrainzFileQuery.

Fixed a lot of includes along the way and removed a lot of unused cruft...

svn path=/trunk/kdemultimedia/juk/; revision=302745