Resolve "[new term] add new classes in scope 1"

Closes #66 (closed)

• Add new class mwo:contactPoint. Definition: A contact point is a person, website or e-mail which provides information concerning a resource. Exact synonym: Point of contact
• nfdico:Website and mwo:contactPerson are subclasses of mwo:contactPoint
• Add new class mwo:ResearchTopic.Definition: A research topic is a specific field of study within a broader academic discipline. Exact synonym: Research subject, research field
• swo:Software is subclass of fabio:work
• remove schema:product
• add rdfs:label to some mwo classes