#125 Refactor DataContainer to allow direct casting and all associated functionality.
requested to merge laughing_man77/apiopenstudio:feature/93-allow-edit-appid-and-key-in-var-store into develop
This merge request. refs #133 (closed) refs #132 (closed) Refs #130 (closed) refs #131 (closed) refs #129 (closed) refs #126 (closed)