This adds support for callbacks telling us when a new library path is
added and when a path has been updated.
Signed-off-by: Anna Schumaker <schumaker.anna@gmail.com>
I've taken a first pass at the Ocarina 6.0 GUI. The backend will need
some tweaking before this design can be used.
Signed-off-by: Anna Schumaker <schumaker.anna@gmail.com>