Merge topic 'string-json-improvements'

1eb5ea3a64 Help(string(JSON)): Clarify that some modes can have zero members/indices
06e6f1e69f string(JSON): Add STRING_ENCODE mode
15973ff247 string(JSON): Add GET_RAW mode

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !11516