SHLWAPI: implement PathIsValidChar{A,W}

[Hans Leidekker]

This patch is based on a patch by Ge van Geldrop that Alexandre
rejected saying:

  "I think a lookup table would be more elegant (and faster...)"

Therefore this version uses a lookup table for all ascii characters
and the first 256 unicode characters. It also has a test showing we
produce results equivalent to the Windows version.

 -Hans

Changelog:
  Implement and test PathIsValidChar{A,W}.
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