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`.
Atoms are at most 32-bit even on 64-bit platforms, per the X protocol,
despite them being stored in a CLong. Even if they weren't (and they
are, see /usr/include/X11/Xproto.h and
https://stackoverflow.com/a/23265984/3407728), xmonadctl isn't unpacking
the CLong into multiple data items.
