[3/3]usp10: handle Ligature Substitution Subtable from GSUB

[Aric Stewart]

this also involves a restructuring of the handling of glyph lookups from 
GSUB since Ligature Substitution can result in many glyphs being 
replaced with 1 glyph, and future looksup may result in one glyph being 
replaces with many glyphs.
---
  dlls/usp10/shape.c          |  247 
++++++++++++++++++++++++++++++++----------
  dlls/usp10/usp10.c          |    2 +-
  dlls/usp10/usp10_internal.h |    2 +-
  3 files changed, 190 insertions(+), 61 deletions(-)


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