patch for ShellExecuteEx(), ShellExecute()

[Martin Fuchs]

This patch fo ShellExecuteEx() is a bit better than that of yesterday.
It also corrects the return value of ShellExecute().
Now winefile does not display the superfluous "Success." message box any more 
when launching an executable in non-shell windows.


Changelog:
* implement flag SEE_MASK_IDLIST for ShellExecuteEx()
  (Now launching of executables in shell windows of winefile works.)
* extend error handling
* correct return value of ShellExecute()
* remove warning message for previously unimplemented flag 
SEE_MASK_INVOKEIDLIST
* add a few TRACE messages

-- 
Martin Fuchs
martin-fuchs at gmx.net
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