Smoothe out integration into utopia

This MR …

• implements setting custom config pools (as started in utopia!261)
• adds --require-matching-names CLI option for project registration
• adds a new framework entry to each project, which allows inheriting information from an existing project
  • This is useful because different utopya projects may be using the same framework, e.g. Utopia
• adds project- and framework-specific updates to the meta-configuration and plot config pools
• implements minor bug fixes that became visible as part of the MR to outsource utopya from utopia

Can this MR be accepted?

• Implementation ready
• Tests added or adjusted (partly)
• Documentation extended or updated (only docstrings)
• Ready for merging
  • Pipeline passes without warnings
  • History cleaned-up or squash option set
  • Changelog entry added
  • Version number bumped

Related issues

Closes #13 (closed) , …