Resolve "Adapt to Core 4.0"

Closes #210 (closed)

added 1 commit

• d847e079 - Adapt to Core 4.0 managed_by feature

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marked this merge request as ready

added 33 commits

• d847e079...21713dd7 - 32 commits from branch master
• 606c4888 - Adapt to Core 4.0 managed_by feature

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added 2 commits

• 91bc264c - Drop sites framework
• bdc5014b - Drop form and field extensions

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merged

mentioned in commit e104d025