Added IBM Selectric-III 96-char typeface element support

[joshshapiro]

Howdy! I've reworked Dave Hayden's redesign from this project to add Selectric-III 96-char ball support. I don't have a resin printer, but the configurability is there; it's ready for testing.

https://github.com/joshshapiro/Selectric_III_typeballs