* First take at new models for improved mapping between client and server
* Add variants to Media
* Re-introduced lost names
* Start breaking apart "Id" reference properties in request models as well
* Refactor to fix OpenAPI spec
* Discard TODO (not relevant)
* Split recycle bin response models
* Delete unused marker interface
* Use reference properties for content and media type handling
* Rework document and media types to be explicit in relations (do not expose "content type", it is an implementation detail)
* Mapping for document and media type copy + move
* Ensure correct response model for Media
* Regenerate OpenAPI JSON after forward merge
* Fix forward merge issues
* Fix forward merge + regenerate OpenApi.json
* Added unit tests for content state helper
* Move "allowed document types" endpoint to document type silo, refactored services and added "allowed media types"
* Regenerate OpenApi.json after forward merge
* Do not include content state for media items
* Review fix
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