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

[Aric Stewart]

Reduce duplicated code.
---
  dlls/gdi32/bidi.c           |  105 
+++++++++---------------------------------
  dlls/usp10/bidi.c           |   95 ++++++++++++++++++++++++++++++++++++++
  dlls/usp10/tests/usp10.c    |   59 +++++++++++++++++++-----
  dlls/usp10/usp10.c          |   45 +++++++++++++------
  dlls/usp10/usp10_internal.h |    3 +
  5 files changed, 199 insertions(+), 108 deletions(-)


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