[xmonad] XMonad.Actions.CycleRecentWS rewrite (new modules inside)

[Jochen Keil]

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Dear list,

after struggling for a while the XMonad.Actions.CycleRecentWS contrib
module, mainly because it actively grabs the whole keyboard (and thus
breaks various functionality, e.g. switching the layout on the fly), I
took the time to rewrite this module.
It now does not actively grab the whole keyboard anymore but relies
only on one passive grab.
I imagine this could be done even more generally, but I am pretty
satisfied with how it works now. However, since theres always room for
improvement new ideas are always welcome. :)

I've included another module which helps to setup up a passive grab on
a certain key. Configuration is a bit (tr)icky, but I hope not too
troublesome.

Best regards,

Jochen
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