Whitespace
[indic-table] Fix category frequency counts in comments
[indic-table] Update to Unicode 7.0 data

Touch code just enough to preserve previous syllable structure
and functionality as closely as possible.  Many further cleanups
coming later.
[indic] Remove special-casing of U+1CF2,1CF3

These were introduced in a498565cedf0441ae723c5e5969f637d792a15e7,
but IndicSyllabicCategory has had the correct value already, so the
special code was never needed.
[indic] Remove some more now-unused special-cases