feat: Support named strings for running headers and footers #680
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Spec: https://drafts.csswg.org/css-gcpm/#named-strings
Implements the named strings feature in CSS Generated Content for Paged Media Module.
string-set
propertycontent()
functionstring()
functionTests:
https://raw.githack.com/vivliostyle/vivliostyle.js/master/packages/core/test/files/#Named_Strings
Closes #545