[2/2]ups10: reimplement ScriptLayout to properly handle mixed runs

[Aric Stewart]

---
  dlls/usp10/bidi.c           |   95 
+++++++++++++++++++++++++++++++++++++++++++
  dlls/usp10/tests/usp10.c    |   59 +++++++++++++++++++++-----
  dlls/usp10/usp10.c          |   45 ++++++++++++++------
  dlls/usp10/usp10_internal.h |    3 +
  4 files changed, 176 insertions(+), 26 deletions(-)


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