Change attribute definition order by name

Introduced a new update action which changes the order of a ProductTypes' AttributeDefinitions by providing the attribute definition's names.

• [API] Added the "changeAttributeOrderByName" update action to ProductTypes.
• [API] Removed the "changeAttributeOrder" update action from documentation. Existing calls to the "changeAttributeOrder" update action are unaffected, but new projects should use"changeAttributeOrderByName".