Add XAF, XOF and XPF currencies

[dirtyhenry]

I noticed 3 currencies that are featured in the ISO 4217 list were missing in the library.

To be honest I could not run gyb easily since the one from the archived Brew recipe seems to rely on [email protected] and I ran into trouble running the most recent version from Apple.

So I added the missing by hand both in the csv file and the .swift code. I hope I didn't miss anything.

🙏