[tracker/tracker-3.0: 3/3] Merge branch '3.0/ontology' into tracker-3.0

[Sam Thursfield <sthursfield src gnome org>]

commit 6d2672890d819e48036a94b01064d742f15a98c2
Merge: 5257c5355 cfce63759
Author: Sam Thursfield <sam afuera me uk>
Date:   Tue Nov 24 15:52:13 2020 +0100

    Merge branch '3.0/ontology' into tracker-3.0
    
    Backport of https://gitlab.gnome.org/GNOME/tracker/-/merge_requests/343

 src/libtracker-data/tracker-class.c     |  80 ++++++----
 src/libtracker-data/tracker-namespace.c |  40 ++++-
 src/libtracker-data/tracker-property.c  | 255 +++++++++++++++++---------------
 3 files changed, 216 insertions(+), 159 deletions(-)
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