[1/2]msctf/test: add sink_fire_ok helper and use it to check sink firing

[Aric Stewart]

prep work to try to tighten up some of these test for failures found 
under Vista/Windows 7
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  dlls/msctf/tests/inputprocessor.c |   92 
++++++++++++++++++++++++------------
  1 files changed, 61 insertions(+), 31 deletions(-)


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