Rework sorting of properties

Summary:
Rework sorting of properties in the file
information panel and tooltips.
Rename "audio" and "music" sorting key to "media" as
they are also used for videos and images.

Final piece for

BUG: 343273

Reviewers: ngraham, bruns

Reviewed By: ngraham

Subscribers: #baloo

Tags: #baloo

Differential Revision: https://phabricator.kde.org/D22024