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`.
This moves the function to help clean up the `Spawner' to the ManageHook
rather than in functions like spawnOn. Probably it makes no difference, the
reason is because there's one manageSpawn function but many different so this
way there are less functions to write.
This patch changes SpawnOn, DynamicHooks and UrgencyHooks to
use X.U.ExtensibleState instead of IORefs. This simplifies the
usage of those modules thus also breaking current configs.
Actions.SpawnOn can now be used to execute arbitrary manage hooks on
the windows spawned by a command(e.g. start a terminal of specific size
or floated).
