Feature:  Viewdata / Teletext on VersaTerm?

Hi David

Do you think it'd be possible to modify the code to support Viewdata (https://en.wikipedia.org/wiki/Viewdata) if the correct font bitmap was created?

`Viewdata offered a display of 40×24 characters, based on [ISO 646] (IRV IA5) – 7 bits with no accented characters`

Thanks!

Josh