applyInput()

TODO: DOCUMENT ME!

TODO: when documenting me, don't forget about the new $scope step you can return from input objects and enums, e.g. EnumType.extensions.grafast.applyScope(), which should yield a value to be passed as the scope property inside the info object in input object fields (inputField.extensions.grafast.apply(target, fieldValue, { scope })) or enum values (enumValue.extensions.grafast.apply(target, { scope })).