Add font-contrast to Python - #49
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Adds font-contrast to Python.
It reads metrics straight out of the binaries with fontTools — x-height and cap height
from
OS/2, the weight axis fromfvar, and mean advance over a–z resolved throughcmapintohmtx— and publishes the result for 54 open-source families as CC0 JSON/CSV.It was written because
OS/2.xAvgCharWidthis unreliable: Poppins declares 0.851 em andmeasures 0.561, and five family pairs declare identical values while their real widths
differ by up to 0.113 em.