FEATURE: NodeType allow unsetting inherited properties

[mhsdesign]

This will make it possible to adjust #4563 (comment). We want to unset the uriPathSegment of the Site:

'Neos.Neos:Site':
  properties:
    uriPathSegment: ~

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[kitsunet]

I am not a fan, as said on Slack, I think if something proclaims to be isOfType($nodeTypeName) one should also be able to expect the set of properties from said $nodeTypeName

[mhsdesign]

I understand and totally agree. It already seems odd that one can change the type of a property (we maybe should disallow this already).

Those are the tests for the current behavior: #4620

It seems there were none before.

[mhsdesign]

We rather want to go the way of being more strict regarding this case #4722