Possible AVIF Support

[BasixKOR]

Hi!

Thank you for making such great software. I'm looking to convert my decades-old photos to a very efficient format and I thought AVIF would be the best fit for this case. I tried to use your software but noticed this doesn't support AVIF yet.

Do you plan to have AVIF support in the near future? Don't hesitate to close this issue as wontfix if you have no intention to support it.

Probably libavif would help a lot if you're going to do this.