Update Reduceron to build and follow best practices for GHC/Cabal/Stack

As touched upon in #36, Reduceron doesn't build anymore due to changes to the GHC/Cabal/Stack. Part of the problem is that Flite is effectively a separate project, but a mandatory requirement for Reduceron. I don't have the expertise to resolve this, but it seems worthwhile to get it back to building, so as an experiment, I'm trying to provide an Algora bounty for this. To make the requirement as clear as possible: * Restore the ability to build everything and run all the regressions with a toplevel `make` * Apply the current best practices for Haskell/GHC projects (sounds like using "stack" is a popular approach). The workaround applied for #36 does not work for me. /bounty $150 EDIT: typos