Implement CFF2 + OpenType variations #88
Merged
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This implements support for decoding CFF2 outlines, and applying variations. Uses the existing variation processor from TrueType variations. Seems to work with the Adobe test font.
Still to do in a separate pull is implementation of some other OpenType variations stuff like GSUB/GPOS adjustments. Also CFF2 -> CFF1 conversion and subsetting for use in PDFKit.