The cabal command interface will drift more and more from
./Setup interface. This is first step: don't assume
they are the same.

This removes need to "patch" setup commands to work with cabal:
the `act-as-setup` SHOULD behave as (simple) ./Setup

There were few setupAndCabalTests which weren't `build-type: Simple`.
For those I made a separate `cabal.test.hs`.

Also added a OutputNormalizer for global tmp directory.
`v2-build` sdists `build-type: Custom` packages to get the list of files
to watch. I guess it's ok to have that functionality,
yet it could be eventually removed, as `v2-sdist`
does not invoke `./Setup.hs` script.