It seems to be a common issue that some SCORM 1.2 modules are trying to store "suspend_data" in cmi.core.suspend_data instead of cmi.suspend_data, which is actually the correct field according to the spec. We're still only storing it once, but will allow getting and setting from cmi.core.suspend_data. Exported JSON will continue to only output spec compliant data.
No longer directly setting error codes on the API when a read/write or data validation fails, throwing exceptions instead that can then be caught by the APi.
