Add more frame font options

[lyqht]

There's no means for user to change the font at the moment.
Personally i'm not sure what fonts to import, and I also don't want to increase MiniQR's bundle size too much by adding many random fonts.

If you're keen to work on this, please propose a standard list of fonts to be added to MiniQR based on reputable metrics/ reliable source of truth.

[thepacmanfan]

I don't have any metrics/data to suggest a font in particular, but I thought I'd share something I am looking for in a different font.

We are using this project for Wi-Fi QR code generation for Wi-Fi routers, with randomly generated Wi-Fi passwords; we would like a font that has slashed zeroes, so zeroes are more easily distinguished from uppercase Os. If we had several fonts to pick from that have slashed zeroes, so we have more design freedom, even better!