Embedded cover art support

[ecroy at gmx.net]

> merge request will follow after some more testing!

Well, finally came around to actually do it, so...

   http://gitorious.org/amarok/amarok/merge_requests/134

The proposed patch works fine for me and at last makes my music collection not look like a greyish dump yard anymore (now it's a colorful one :o)

Testers and feedback would be very welcome!

Thanks,
  Andreas
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