Add non-slashed zero

[duckbedsun]

Please add a non-slashed zero as an optional font feature.

[abhiramakella]

The 0 was slashed to prevent anyone from confusing the 0 with the Capital O.

[jacobxperez]

@duckbedsun I don't have plans on adding a none slashed zero because it was done to prevent confusion with the Danish Ø however, I do plan on adding an alternative dotted zero to Atkinson Hyperlegible Pro.