Merge topic 'json-exporter-arrays'

81858651 JSONSceneExporter: add release note
aaa489e8 JSONDataSetWriter: improve PrintSelf
f4d4108e JSONSceneExporter: support array selection for each prop/source
666f5895 JSONDataSetWriter: support array selection
b65eba29 vtkExporter: add missing separators

Acked-by: Kitware Robot <kwrobot@kitware.com>
Acked-by: buildbot <buildbot@kitware.com>
Reviewed-by: Lucas Givord <lucas.givord@kitware.com>
Reviewed-by: Mathieu Westphal (Kitware) <mathieu.westphal@kitware.com>
Merge-request: !11713