Sugar for importing some things unqualified and the rest qualified

#21

For reference, there’s already a Haskell preprocessor require that implements the desired syntax.

Instead of

import Data.Text (Text)
import qualified Data.Text as Text
import Data.ByteString (ByteString)
import qualified Data.ByteString as ByteString

You can write:

require Data.Text
require Data.ByteString

It has all the pros and cons of being an external compiler plugin instead of being a GHC feature.

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