++++++++++++++++++
* refactor code, switch back to lowercase&underscore code style, split cns_schema into cns_model, cns_validate, cns_convert, cns_graphviz
* remove cns_creativework
* refactor cns_item validation logic and code
* add run_normalize_item, covert property value by schema template definition
* add stat_json_path, count json object for jsonpath, values, unique values, samples and value distribution
* rewrite validation code, update validation report