Report results asynchronously in DataBaseResolver.
Added worker management to PipeLine. Spotify not working properly yet
Fixes in Query/ScriptResolver/PipeLine and libspotify wrapper.
Fixed reference leaks in spotify JNI related code in tasks.cpp
Reverted worker priority queue in PipeLine.
Only resolve visible Queries.
Don't cache Results anymore.
Associate results correctly in SpotifyResolve by qid.
Resolve 10 queries after the currently playing track.