HarfBuzz does not use UCDN anymore

[behdad]

Hi,

I like to thank you for UCDN again. It served HarfBuzz very well for many years. Recently I was trying to squeeze bytes out of HarfBuzz and replacing UCDN become a fruitful target. Please see:

harfbuzz/harfbuzz@65392b7

The generator can be used for other arrays as well, in case you want to use it in other places or regenerate UCDN based on it.

Cheers,
b

[behdad]

The following two packages are used by the new generator (gen-ucd-table.py):
https://github.com/harfbuzz/packtab
https://github.com/harfbuzz/youseedy