Add variable font support to ttread #957
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cjchapman
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Sep 6, 2019
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Added an optional
UDVparameter tottrBegFont()to specify a VF instance.Use varread library to calculate glyph widths from HVAR table.
Added a bunch of code to calculate glyph coordinates' variations using the gvar table.
Added AdobeVFPrototype.ttf as a test font along with a tx test case to instantiate & convert to
tx -3output.