Hand note att scope

[SteffenAstheimer]

This PR limits possible values for handNote/@scope.

• only one @scope="sole" is allowed
• a @scope="sole" cannot be accompanied by additional handNotes
  • in hindsight, that makes the first rule kind of redundant
• a @scope="major" requires at least one @scope="minor"
  • this should prevent to use "major" instead of "sole"

Additionally it might be good to add that a @scope="minor" needs at least one @scope="major" but there are too many files that don't specifically declare a hand for the author and just use a minor scoped hand for the deviating hand, so I left that out for now.

This PR also added "actor" to the includes list for sources specs, which is already in the generated ODD's since abc13d9 but somehow slipped through in the src/Specs itself.

[peterstadler]

Looks generally good to me