- Move Validator to pkg/object/validation
- Replace ValidationError with validation.Error
- Replace MultiValidationError with generic MultiError
- Update Validator & SortObjs to use MultiError
- Add ResourceReferenceFromObjMetadata
- Rename NewResourceReference -> ResourceReferenceFromUnstructured
- Delete duplicate ResourceReference.ObjMetadata()
- Modify some error messages for consistency and clarity
- Use templating to generate some test artifacts
BREAKING CHANGE: apply-time-mutation namespace required for namespace-scoped resources