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`.
These layout have different applications but their names could cause some
confusion since the module names could just as well be swapped. To support this claim,
what we call "spacing" is named "gaps" in i3wm (i3-gaps). Therefore hyperlinks have
been added to inform the reader of the existence of the other module.
