Enable displayCond in EditingInterface.yaml

[typecat]

As an integrator, I can define display conditions for a field in the EditingInterface.yaml, so that the field is only shown in certain cases.

Acceptance criteria

• Display conditions for a field can be defined in the EditingInterface.yaml
• A field having a display condition is only shown in the editing interface if that condition is met

[typecat]

Needs some conceptional work first.