cmap-format12-only files created by ttx & remove all other cmap entries

Inconsolata-Regular.abc.widerc.ttf has the hmtx width of "c" set to 600; everything else is 500. Subsetting out c should reduce numberOfHMetrics to 1.

chromacheck-* fonts are from https://github.com/RoelN/ChromaCheck/tree/master/fonts and licensed under MIT by Roel Nieskens and Google.

RanaKufi-Regular.subset.otf is from https://github.com/alif-type/rana-kufi/ but the subset is licensed for us in MIT for the project use.

glyphs.ttf is from https://github.com/RazrFalcon/ttf-parser/blob/337e7d1/tests/fonts/glyphs.ttf

Estedad-VF.ttf, licensed under OFL 1.1, is from https://github.com/aminabedi68/Estedad

graphite2-expansion.ttf is a synthetic three-glyph font generated by
../generate-graphite2-expansion-font.py. Its Graphite substitution rule expands
each "a" to 41 glyphs, for testing buffer growth failure.
