widl: Add support for non-basetype return types.

[Robert Shearman]

---
  dlls/rpcrt4/tests/server.c   |   10 +
  dlls/rpcrt4/tests/server.idl |    2 +
  tools/widl/client.c          |   13 ++-
  tools/widl/proxy.c           |   13 ++-
  tools/widl/server.c          |    8 +-
  tools/widl/typegen.c         |  439 
++++++++++++++++++++++--------------------
  6 files changed, 272 insertions(+), 213 deletions(-)
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