grltrackerplaylists: Add insufficient tagged playlist & remove SongsView
This introduces a playlists that contains songs that are not tagged enough to get displayed in any of the other views.
It also removes songsview.
Issues
- The playlist size is not limited: since we use regular
GtkListBox
s for playlists it possibly can not handle the amount of songs. - No indication of where the offending song/file can be found.
Edited by Marinus Schraal