Support the ability to suppress code sets A and B for Code 128 Barcodes

[alex-newby-hmrc]

I understand that OkapiBarcode supports suppressing of code set C for Code 128 barcodes using the setSuppressModeC method. It would be convenient for a project I am working on if it could, through a similar mechanism, suppress code sets A and B as well. I would like to request this feature!

[gredler]

Going back through all bugs, and was thinking about this one a bit. Can you provide some examples where this feature would be useful? Suppressing mode C doesn't affect our ability to encode data, since numbers can also be encoded using modes A and B, but suppressing modes A or B would mean that not all data could be encoded. Just trying to wrap my head around the utility of such a feature.