This essentially moves the Sinhala script from the `Indic' hinter to
the `Latin' hinter.
* src/autofit/afblue.dat: Add blue zone data for Sinhala.
* src/autofit/afblue.c, src/autofit/afblue.h: Regenerated.
* src/autofit/afscript.h: Add Sinhala standard character and move data
out of AF_CONFIG_OPTION_INDIC block.
* src/autofit/afranges.c: Move Sinhala data out of
AF_CONFIG_OPTION_INDIC block.
* src/autofit/afstyles.h: Update Sinhala data; in particular, use
AF_WRITING_SYSTEM_LATIN.