This table allows us to work with Library playlists that are represented
by a filesystem path. The user can manually enable or disable library
paths to prevent their tracks from showing up in the Collection
playlist. Additionally, library paths have an online property to
determine if the library still exists in the filesystem to prevent us
from removing tracks due to a broken NFS mount or symlink.
Signed-off-by: Anna Schumaker <Anna@NoWheyCreamery.com>