Do not print unicode characters by default
Created by: mario-bucev
This change partially addresses https://github.com/epfl-lara/stainless/issues/1355
Printing of unicode characters is now an opt-in through --print-unicode
Created by: mario-bucev
This change partially addresses https://github.com/epfl-lara/stainless/issues/1355
Printing of unicode characters is now an opt-in through --print-unicode