Add an option "replace non-ASCII with ASCII" to the BulkAttributeRenamer

Add an option to the BulkAttributeRenamer which replaces non-ASCII characters in AttributeNames with ASCII in a standardized way.

• e.g. Ö->O, Ø->O, ø->o, æ->ae
• UTF-8 code c380 to caaf

Would be useful e.g. with PostgreSQL writer etc.