strmbase: Implement BaseDispatch

[Aric Stewart]

The IDispatch method for directshow filters on windows is broken.  It 
does not conform to COM rules, cannot be directly queried and is unaware 
of any methods outside of the direct interface inheriting the IDispatch 
interface. Being broken in this was allows for a helper like this one.

---
  dlls/strmbase/Makefile.in |    1 +
  dlls/strmbase/dispatch.c  |   82 
+++++++++++++++++++++++++++++++++++++++++++++
  include/wine/strmbase.h   |   10 +++++
  3 files changed, 93 insertions(+), 0 deletions(-)
  create mode 100644 dlls/strmbase/dispatch.c


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