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Bugfix: Do not disregard Ref::gen when using Ref as a cache key

Oliver Sander requested to merge sander/poppler:fix-ref-comparison-in-arthur into master

According to Leonard Rosenthol's book, the 'gen' field of a reference is almost always zero. However, this doesn't mean that it can be ignored when comparing two Refs.

Incidentally, this patch also makes use of the recently introduced Ref::operator<, which allows to replace the small custom class ArthurFontID by a std::pair.

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