[autofit] Add support for Arabic script.

Thanks to Titus Nemeth <tn@tntypography.eu> for guidance!

* src/autofit/afblue.dat: Add blue zone data for Arabic.

* src/autofit/afblue.c, src/autofit/afblue.h: Regenerated.

* src/autofit/afscript.h: Add Arabic standard characters.

* src/autofit/afranges.c: Add Arabic data.

* src/autofit/afstyles.h: Add Arabic data.

* docs/CHANGES: Document it.
8 files changed