usp10: [RESEND] Add ScriptItemize, ScriptShape and ScriptPlace functionality

[Jeff L]

This patch is a resend that combines the code and the tests, sent 
previously as two patches, into one patch.

This patch adds functionality to perform unicode to glyph translation 
using existing api calls.  Three APIs implement this:
ScriptItemize, ScriptShape and ScriptPlace.  ScriptGetProperties is
implemented as a number of programs apparently check through it so I
have added the first few entries to give them something bite on.  A stub
for ScriptTestOut has been added.  Tests are included in this patch, 
note a new tests directory is required.

Jeff Latimer

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