Introduce timestamp for plan publishing and use for color coding

Benjamin Hättaschrequested to merge
feature-colors into main
  • Introduce a new field that denotes the timestamp when the plan was published
  • Introduce admin actions to publish and unpublish the plan and set that timestamp accordingly
  • Prevent other means to change visibility of the plan
  • Use that timestamp to only highlight recent changes when they occurred after the plan was already published

This implements most of #159 (closed) -- only a link to directly toggle the changing from the change or status view is missing, but that requires !133 (merged) to be merged first

Edited by Benjamin Hättasch

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