Add jpeg-xl / jxl as target image format

[BuZZ-dEE]

Please add jpeg-xl / jxl as target image format.

[antermin]

Duplicate of #45 and #13

[BuZZ-dEE]

Is this really a duplicate of #13 ? It seems to me, it is a sub task.

[antermin]

@BuZZ-dEE

In #45 (comment), the owner explained why they closed it as a duplicate of #13.

If you have anything to add about JPEG XL or other formats, it is best to comment in #13.