Remove all of the temporary defines, structures, old compat fuctions, extra fields, etc... that were needed during the conversion to a split set of json_object_* structures.
The default is now that string data is stored inline at the end of json_object, though to allow for json_object_set_string() to set a _longer_ string, we still need to allow for the possibility of a separate char * pointer.
All json types have been split out now, next step it cleanup.
