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What kind of change does this PR introduce?
This adds support for spot colors - see PDF Association and Adobe for details.
A new
PDFDocument.addSpotColor
method has been added:The code was originally written by @ziaenezhad who mentioned it in #756
Then @sekforde submitted #1457 which was closed unmerged.
My code is based on the two contributions above, but I've also added a test, and updated the documentation and changelog. So hopefully this in a more mergable condition.
Checklist: