Move its dependents too.

This introduced a failure, which we tracked down to a test case like this:

  U+092E,U+094B,U+094D,U+0930

The final character is a Ra that should be put in a syllable of it's
own.  And we do.  But it will interact with the Halant before it.  So
now we finally are convinced that we have to limit features to syllable
boundaries.  That's coming after lunch!

Reusing the consonant logic!

20 was way too low, one could hit a syllable with 7ish consonants with it.

Another 1.5% down.

Another 12 thousand failures gone! (78 to go)

Like Uniscribe does.

Shaping failures on Hindi Wikipedia go down from 25% to 14%!

Fixes 10% of the failures against all of Hindi Wikipedia!

Should have no visible effect.

Fixes 200 failures out of previous 4290 cases in the OO.o Indic
dictionary (of ~16000 entries).

In preparation for Hangul shaper.

Based on patch from Jonathan Kew.

Where causing issues for people with MSVC.

Read comment.

Not sure where this is documented, but I remember this being the desired
behavior.

test-shape-complex failures are down from 48 to 46.  Meh.

Not quite working just yet.  False alarm re 10 failures.  It was
crashing.  Ouch!  Back to 48 failures.

Not applied yet.