Made display properties virtual: WTI-1980- Made them virtual in order to override the attributes in the derived classes for the custom ordering of the categories.
Incorporated comments 3543: WTI-1798- Got rid of the generic parameter on the synchronization service and in effect also on the consuming handlers and helpers
Incorporated comments 3543: WTI-1798- Introduced ClearIllustrationPoints on the StructuresCalculation interface in order to get rid of the generic parameter
