Build changes: QSUI moved to media-sound/qmmp (USE-flag needed, also for skinned UI). Also I think that qmmp-plugin-pack should have USE-flags for its plugins.
I committed the packages but they are masked for now. I want to see if there needs to be further clean up. The qmmp-plugin-pack IUSE request needs to be handled on separate bug but I don't quite see the point. The package is rather small.