* get all song coverArt as they are rendered
doing it all up front was too heavy
temporarily disabled mapping artwork in setQueue, need to fix this
* use cache data for track artwork when available
* fix round art in context menu for songs
* set only the first artwork at play time
then set the rest in the playback service
* handle both cached images and fetching images
* remove commented code
* fix shuffle
fix first thumbnail not being updated on shuffle for now playing background