Start migrating Ghc -> GhcMod monad
Ghc -> GhcMod: Browse, Check
Move `convert` to it's own module.
Ghc->GhcMod: finish Browse, Check
Don't expose `Convert`
`Types` doesn't export `convert` anymore
Add `TestUtils` to `other-modules`
Merge pull request #257 from DanielG/dev-monad

Migrate Browse and Check to GhcMod monad