Qualify identifiers of imports from GHC's API as GHC (#840)

* Qualify as `GHC.Hs`

* Qualify as `GHC`

* Qualify as `GHC.Types.Basic`

* Qualify as `GHC`

* Qualify as `GHC.Types.Fixity`

* Qualify as `GHC`

* Qualify as `GHC.Types.ForeignCall`

* Qualify as `GHC`

* Qualify as `GHC.Types.Name`

* Qualify as `GHC.Types.Name.Reader`

* Qualify as `GHC`

* Qualify as `GHC.Types.SourceText`

* Qualify as `GHC`

* Qualify as `GHC.Types.SrcLoc`

* Qualify as `GHC`

* Qualify as `GHC.Unit.Module.Warnings`

* Qualify as `GHC`

* Qualify

* Qualify as `GHC`

* Qualify

* Qualify as GHC

* Qualify

* Qualify as `GHC`

* Qualify

* Qualify as `GHC`

* Qualify

* Qualify as GHC

* Qualify as `GHC`

* Qualify

* Qualify as GHC

* Fix

* Format

* Fix

* Fix