Fixing FieldNames. It contained several missing references.
Also: FieldNames has been moved to editor-schema. This allows us to reference the class in Exporter
Refactoring RenameScene and Rename actions. Also RenameTest has been updated and now it compiles and runs well.

Note: Rename still needs refactoring to comply with latest action refactorings, but it's better to do that once all tests are back up and running again.