Added new pragma style `line'

I added new style for language pragma called `line` (there could be better name, I think).

It's like `compact` style, but it adds `{-# LANGUAGE ` to each line like below:

```haskell
{-# LANGUAGE ConstraintKinds, DataKinds, FlexibleContexts, GADTs             #-}
{-# LANGUAGE MultiParamTypeClasses, NoImplicitPrelude, ParallelListComp      #-}
{-# LANGUAGE RankNTypes, ScopedTypeVariables, TemplateHaskell, TypeOperators #-}
```