Add support for PNG/APNG metadata

[Euphoria]

Please forgive if this is considered a crosspost as this feature would be very useful in both Classic and MP versions.
As PNG pretty much the most used lossless image format these days, so is the importance and usage of PNG Metadata has grown.
Please add support for viewing, editing, and saving PNG Metadata.
Included is an example image containing metadata critical to the context of the image.

PNG containing example metadata that is critical to it's context.

03333-20230130055555-[sampler]-step_[steps]-3406273962-before-highres-fix.png (321.44 KiB) Viewed 1586 times

[ckit]

+1

[PlushySD]

This +1 and if you can search those meta data in PNG files. That would be awesome!

[xnview]

you can already edit XMP metadata