Fix for command history failing to include new commands

Needed to delete a filter in CommandHistoryWriter because it was
removing SetSemanticType commands if the user decided to change their
minds.  Need a better way to consolidate history.
Deprecate WorksheetR2RMLSesameModelParser

Should either be deleted or brought up to date.
Add a POM for a template that is compatible with a class link

Without this the RDF generator won’t process the subjectmap of a node
that only has a class link and no other outgoing links.