Use Case diagram generator: Add CML metadata to diagrams

[stefan-ka]

In CML we have more metadata about use cases and user stories, such as benefit, scope, level, interactions, etc. See https://contextmapper.org/docs/user-requirements/. Maybe we can add such infos to the Use Case diagrams as notes...

[stefan-ka]

Scope, Level, and Benefit can be added per UC as note:

[stefan-ka]

For all UCs it could use lots of space, depending on benefit.

What do you think @socadk?

[stefan-ka]

Fixed with v6.9.0.