[xmonad] new extension: XMonad.Layout.ShowActive

[smschm]

Hi XMonad list - long time user, first time extension submitter.

I'm attaching an extension called ShowActive that it would be a  
stretch for me to say I wrote (it's about 99% ShowWName, I just cut  
parts out).  On each layout it pops up a small square in each window  
for a short time, with the active window colored differently.  This  
works much better for me than borders when alt-tabbing to  
spot-identify which window got focus.

Now, I'm just attaching the raw .hs file instead of a cabal patch  
since I cant get the development version of XMonadContrib to compile  
against my stock xmonad-8.1, and I don't want to upgrade to the  
bleeding edge in case it breaks anything.  Maybe someone else, if they  
think this is useful, can make a patch out of it.  Or, if someone else  
knows how to make a patch without requiring that XMonadContrib  
compiles, let me know.

Enjoy,
Steve
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