Allow wildcards in plot_only

This MR adds the possibility to use wildcards (*, ?,...) in plot_only. The wildcards are matched against plot names using fnmatch.

This furthermore improves the error messages on invalid plot function names, e.g. by explicitly restricting using bad names.

Can this MR be accepted?

• Implementation ready
• Tests added or adjusted
• Documentation extended or updated

• Code quality
  • Changes follow coding guidelines
  • Checked code coverage on new and adjusted code

• Ready for merging
  • Pipeline passes without warnings
  • History cleaned-up or squash option set
  • Changelog entry added
  • Version number bumped
  • Reviewed & approved by @ (skipping review here due to everyone's high workload atm)

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