Make setup work on mingw

I think case looks for complete word tokens so I need the *. I'll keep
it for cygwin too (to make the two bash files consistent).

MinGW doesn't provide stty.exe, so skip it.
Remove operator-camelize

abolish's coerce does the same, but provides more options and I'm
actually using it. It's not quite as powerful (since it just operates on
the current word or selection), but it's simpler (it assumes current
word which is my common use case).

Remove long-forgotten mappings to operator-camelize.