SoC idea: finish wcmd

[Dan Kegel]

wcmd isn't thought of as sexy, but it's important;
for instance, some installers use it under the hood.
Things like
  if "%1" == "%2"
and the /wait commandline flag are not yet implemented.
It wouldn't be all that hard to get wcmd far enough along
to make those installers happy; I think it'd make a good SoC project.
- Dan

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