Added FetchMultiple overrides to accept a Sql argument
Minor cleanup in main FetchMultiple method
PetaPoco T4 Modifications
Added SingleOrNew definitions to Record<T>
Added a new class ChangeTrackedRecord<T> that inherits from Record<T> for tracking changes
Modified template to utilize ChangeTrackRecord if TrackModifiedChanges is true
Added property to allow turning track changes on for individual tables.