message: Use alphabetical order for consistency
diff: @@ -799,6 +799,7 @@ const string T::CATEGORY(category); \
  ElementRegistry<T> registry##T; \
  INSTANTIATE_SUBCLASS(T)
  +INSTANTIATE_CONCRETE_SUBCLASS(AttributeDef, "attributedef")
  INSTANTIATE_CONCRETE_SUBCLASS(Backdrop, "backdrop")
  INSTANTIATE_CONCRETE_SUBCLASS(BindParam, "bindparam")
  INSTANTIATE_CONCRETE_SUBCLASS(BindInput, "bindinput")
  @@ -831,7 +832,6 @@ INSTANTIATE_CONCRETE_SUBCLASS(TypeDef, "typedef")
  INSTANTIATE_CONCRETE_SUBCLASS(Unit, "unit")
  INSTANTIATE_CONCRETE_SUBCLASS(UnitDef, "unitdef")
  INSTANTIATE_CONCRETE_SUBCLASS(UnitTypeDef, "unittypedef")
  -INSTANTIATE_CONCRETE_SUBCLASS(AttributeDef, "attributedef")
  INSTANTIATE_CONCRETE_SUBCLASS(Variant, "variant")
  INSTANTIATE_CONCRETE_SUBCLASS(VariantAssign, "variantassign")
  INSTANTIATE_CONCRETE_SUBCLASS(VariantSet, "variantset")
  