Using X.U.Parser works almost as a drop-in replacement for ReadP here.
In some places (like `parseSpecial`) we need to be a little bit more
careful when constructing the parser, but this is offset a much simpler
`readKeySequence`.
This is a convenience module in order to have less import noise. It
re-exports the following:
a) Commonly used modules in full (Data.Foldable, Data.Applicative, and
so on); though only those that play nicely with each other, so that
XMonad.Prelude can be imported unqualified without any problems.
This prevents things like `Prelude.(.)` and `Control.Category.(.)`
fighting with each other.
b) Helper functions that don't necessarily fit in any other module;
e.g., the often used abbreviation `fi = fromIntegral`.
