add `based on` relation for scenarios

[stap-m]

Description of the issue

To relate scenario with scenario study and scenario projection, we want to introduce an object property based on. See https://github.com/OpenEnergyPlatform/oekg/issues/14

Ideas of solution

• based on: A relation between a scenario study or projection and a sceanrio, that indicates the scenario that provides the assumptions on which the respective scenatio study or projection is based on.
• domain: 'scenario study' or 'scenario projection'
• range: scenario
• axiom: 'scenario study' 'based on' some scenario
• axiom: 'scenario projection' 'based on' some scenario

Workflow checklist

• [ ] I discussed the issue with someone else than me before working on a solution
• [ ] I already read the latest version of the workflow for this repository
• [ ] The goal of this ontology is clear to me

I am aware that

• [ ] every entry in the ontology should have a definition
• [ ] classes should arise from concepts rather than from words

[l-emele]

I agree.

[stap-m]

Solved by PR #1346