* Moved refactor from V12 based branch
* Remove obsolete config property to avoid obsoletion warnings
* Clean up test models
* Make the datatype API a little less confusing by introducing explicit models for create and update
* Remame "Configuration" to "Data" to make FE happy :)
* Safeguard deserialization of empty configs
* Less strict number handling for deserialization
* Prepare for data type config migrations
* Attempt to have contextual config serializers
* Update OpenAPI spec with (temporary) data type controller
* Fix unit tests
* Update compat suppressions (allow breakage for datatype and configuration editor)
* Make the duplicate JsonObjectConverter implementation private
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