[#585] Cleaning up JSON* classes

A number of JSON* classes were introduced in the repository (591b6d3d7ff44643dc637cd94e2fafac131697f7) and we also have multiple JSON processing libraries.  Cleanup eliminates some of the libraries.  Eventually we should use a single library for all JSON processing.
`org.json.JSONObject` is not used. Do you have the Eclipse _Preference_ file in that workspace? It should detect that and removed the unused import.