Remove optimization phases, update package.yaml-s

[TheMatten]

Fixes polysemy-research/polysemy-zoo#65 by removing optimization phases, which weren't really used up until now and don't solve the original problem anyway. Additionally I've fixed warnings in package.yaml files and fixed bound on th-abstraction being modified only in polysemy.cabal.

[googleson78]

travis not passing, but of course it doesn't show up in the PR for some reason :)
https://travis-ci.org/github/polysemy-research/polysemy/builds/738241715

[TheMatten]

travis not passing, but of course it doesn't show up in the PR for some reason :)
https://travis-ci.org/github/polysemy-research/polysemy/builds/738241715

Warning: Packages using 'cabal-version: 2.0' and the autogenerated module
Paths_* must include it also on the 'autogen-modules' field besides
'exposed-modules' and 'other-modules'. This specifies that the module does not
come with the package and is generated on setup. Modules built with a custom
Setup.hs script also go here to ensure that commands like sdist don't fail.

So I guess I should just add them to generated-other-modules too? 😄

[TheMatten]

CI is green now 🎉