Added reading of JPEG2000 palettes #7870
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Resolves #7511
This reads palette data from the JPEG2000 pclr box, and assigns it to the image's palette.
I used page 28 of https://web.archive.org/web/20230327234610/https://wiki.opf-labs.org/download/attachments/11337762/15444-1annexi.pdf as a reference.
This is a recreation of #7867 after I accidentally deleted it.