added area classification concepts from regional planning #1766

[viktorwichern]

To describe data sets, different areas of German regional planning had to be added. These are:
Vorranggebiete
Vorbehaltsgebiete
Eignungsgebiete
Vorranggebiete mit der Wirkung von Eignungsgebieten
After finding English labels and definitions we decided to implement these as roles and corresponding equivalent regions, where priority region with effect of suitable region has not one corresponding roles but inheres the roles of priority regions and suitable regions.
Since the concept of spatial planning policies was not yet in the ontology, we decided to add it.
While working on the issue, we realised that the definition of policy instrument was outdated and decided to change it.
For a more detailed overview, see issue #1766.

Add

• priority region role
• priority region
• conditionally reserved region role
• conditionally reserved region
• suitable region role
• suitable region
• priority region with effect of suitable region
• spatial planning policy

Change

• policy instrument

Workflow checklist

Automation

Closes #1766

PR-Assignee

• 🐙 Follow the Pull Request Workflow
• 📝 Update the CHANGELOG.md
• 📙 Add #'s to term tracker item

Reviewer

• 🐙 Follow the Reviewer Guide
• 🐙 Provided feedback and show sufficient appreciation for the work done

[stap-m]

@viktorwichern could you please add the §7 Absatz 3 ROG as definition source and maybe link to https://www.gesetze-im-internet.de/rog_2008/__7.html

[stap-m]

Please update the changelog file, too.

[stap-m]

Mainly some minor changes for clean documentation.

[stap-m]

Thanks. Looks good to me now!