reactivate artist button ready for new artist treeview
refactor to separate data model from the view to be analagous to how album data model is done
display albums for artists when the artist is expanded
display artist and album images in tree-view
connect click and double click events
rework to use selection changed event which is similar to how the iconview is done
ensure startup of view has a collapsed paned and is also initialised correctly when switching to it from another view
add clickable header for sorting
add dummy column so that main column doesnt excessively expand to fill the space
various cleanups and use RB.search_fold for ordering of track artists
refactor toolbar stuff into its own module
remove obsolete file
update toolbar signal whenever view is initialised or moved to
remove unnecessary file
disable rather than hide toolbar objects
convert adding of artists as iterators to improve visual appearance when loading
change view to be an album-artists view
remove unneeded file
some cleanups
link filters to artists so that they show or hide artists in the treeview