Implement support for dispatch variant marshalling

[Mike Hearn]

This isn't the most efficient implementation possible, but it's simple
and easy to read. I don't know of any apps that would really stress this
part of the RPC system, so that shouldn't cause issues.

In the current codebase CoMarshalInterThreadInterfaceInStream() doesn't
do much of course, but that will hopefully change in future. 

This support was tested on my Java<->IE app, which makes use of
extensive IDispatch marshalling. I haven't tested it with other apps
though.

ChangeLog:
Implement support for dispatch variant marshalling
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