add jpeg xl support to xv#48
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Adds loading and saving of jpeg xl images to xv based on libjxl (0.12.0).
Limitations:
(xv does - as far as I know - not support transparent images)
Caveats:
The work is based on the libjxl documentation, sample code and other
jxl integrations (esp. image magick).
But I'm not an expert in many details esp. regarding color handling and
exif data. So there is no guarantee that this works in all cases.
All I can say is: I'm not aware of issues.
Also I'm not familiar with cmake, I somehow got the cmake file for jxl set up, but I'm not sure, how good it is...