[SingleTable] Option to print Unicode box char instead of VT100 escaping

[thenger]

I think many terminals can now print Unicode box drawing characters.

In my case (in putty) I had to change my config to "Enable VT100 line drawing even in UTF-8 mode" whereas the terminal emulator can fully print all Unicode box drawing characters.

This ticket is a request to add an option to print Unicode chars instead.

I would suggest it to be the default behavior, but I guess there is a reason you didn't do that. Maybe you can explain it to me ?

Regards