Browse/File sort order to be directories first, otherwise all items
alphabetically.
Final sort order to be left to clients.
Change mopidy/file/library.py to sort as described.
Remove changes to:
1. docs/ext/file.rst
2. mopidy/file/__init__.py
3. mopidy/file/ext.conf
Thanks go to sumpfralle for providing the base code for the sort lambda
and stable sort suggestion.
Signed-off-by: Caysho <caysho@internode.on.net>