Fira v.3.109

version/build 3.109

_ https://github.com/mozilla/Fira/issues/43
* impossible to get equal values for all OS issues with common methods.
= catch:
> set typoLineGap to 400 (was 200)
> set winDescender to -350 (was -500)
! known bug: cuts of lowest glyphs (-353 Ultra)
? Arabic (should not become lower)
? Vietnamese (should not become higher)

_ fixed zero width glyphs with no zero value
_ fixed PS hinting issues coming up changing grid in the very thin
weights