Added optional, defaultvalue and cararg to widl

[Jacek Caban]

I sent this patch yesterday, but it got lost (I can't see it in
mail archives), so I'm resending it.


I sent patch to widl:
http://www.winehq.org/hypermail/wine-patches/2004/12/0490.html
Please ignore that one. Those chages are incuded in this patch.

Changelog:
     - Added optional, defaultvalue and vararg
     - Fixed defining DIIDs

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