Merge topic 'json-pass-state'

7b7fc2df0b cmJSONHelpers: Allow passing state context
30336dab66 cmJSONHelpers: Restructure cmJSONHelpers

Acked-by: Kitware Robot <kwrobot@kitware.com>
Acked-by: buildbot <buildbot@kitware.com>
Merge-request: !7231