Resolve "Adapt to Core 4.0"

Closes #247 (closed)

added 2 commits

• c2aef27c - Fix migrations
• ed374715 - Adapt to Core 4.0 managed_by feature

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added 1 commit

• a400c593 - Adapt to Core 4.0 managed_by feature

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marked this merge request as ready

added 5 commits

• a400c593...60df77b5 - 4 commits from branch master
• 73b75742 - Adapt to Core 4.0 managed_by feature

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added 20 commits

• 73b75742...70c79341 - 19 commits from branch master
• fbb35c3d - Adapt to Core 4.0 managed_by feature

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added 1 commit

• 44ad0648 - Drop sites framework

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added 1 commit

• 92d5a25c - Update Stoelindeling

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merged

mentioned in commit b9a45f25