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`.
A set of hooks, and convenience combinators, to help with ManageHook debugging.
Ordinary users may well want to use debugManageHookOn in normal configs,
specifying a key sequence which can be pressed before running a command in
order to capture debug information just for that command's main window.
This is especially useful when trying to diagnose issues such as programs
that do not play well with SpawnOn, or ManageHook matching on 'title' when
the program does not set the window title until after it is mapped.
