widl: Add support for generic binding handles.

[Robert Shearman]

---
  tools/widl/client.c    |   32 +++++++++++++++++++++---
  tools/widl/header.c    |   62 
++++++++++++++++++++++++++++++++++++++++++++++-
  tools/widl/header.h    |    3 ++
  tools/widl/parser.y    |    2 +-
  tools/widl/widl.c      |    1 +
  tools/widl/widltypes.h |    2 +-
  6 files changed, 94 insertions(+), 8 deletions(-)
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