Story #12690: As an administrator I can set up the conference base data
Adjust Models to enable editing
Currently we're using the @Id annotation in the models Circular, IntermissionType, Location, Room and SessionType to mark the title/subject as identity.
This leads to the fact that those can't be edited anymore (see #13324)
The Id annotations should be removed so that FLOW3 introduces the flow3_persistence_identifier
Note: To be able to migrate the database on the live server, a doctrine migration must be provided.