Remove unfollowed assets from Libraries about iris HOT 2 CLOSED

In Library status detected by a URI's presence in the ui.library_{asset} array. When checking an item's library status, if in library, we add it to this array. This means there is no way of checking if we've loaded our first batch of records (on load of said Library page).

1. Detect and remove duplicates in library indexes
2. Detect whether we have actively loaded a library, or if it's populated consequentially. This will decide whether on load of Library page, we fetch the first batch or not.
3. Add Follow/Unfollow to relevant context menus. On show of context menu, we may need to call Spotify to fetch follow status. Confirm authorized status first.

from iris.

Ready for the next release

from iris.