TMSS-849: improved resolved_refs by making it fetch the definitions from the remote schema, and injecting it in the local schema's definitions.

Updated changes

TMSS-272: extracted common data structures into commonschematemplates. updated all templates with 's to the commonschematemplates. tweaked and updated using code. fixed tests

TMSS-153: added json_utils and tests. method get_default_json_object_for_schema returns a valid json object for the given schema with all properties with their default values