usp10: Add ScriptItemize, ScriptShape and ScriptPlace functionality

[Jeff L]

This patch replaces a previous one and 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 in a following patch.

Jeff Latimer
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