Should solve error `data/forward_scheme must be equal to one of the allowed values` when configuring a Redirection Host with scheme set to `auto`. #4074
- /schema now returns full openapi/swagger schema
- That schema is used to validate incoming requests
- And used as a contract in future integration tests
- Moved route files up one level
- Fixed incorrect 404 reponses when getting objects
- Fixed saving new objects and passing jsonschemavalidation