ISKeyValueListReadOnly; Properties were being used when they should have been Methods

All of the 'Get' read-only properties in the ISKeyValueListReadOnly object have been changed to methods, as has the 'HasValues' property.

This matches the ISKeyValueList object of which this is simply a wrapper, generally used to restrict access to UserData in global collection items such as finBranchRO.

NOTE: This is flagged as a breaking change but should not affect any Script or other external code accessing this type of object under normal circumstances.