[xmonad] Xmonad-contrib AppLauncher

[Mats Rauhala]

The XMonad AppLauncher doesn't work properly with filenames with spaces.
It seems to be because it uses the 'spawn' function from core. I
replaced the spawn with safeSpawn from XMonad.Utils.Run for my instance,
but I'm not sure how it would affect the "grand plan". I also can't make
a patch since the tests fail on -fglasgow-exts.
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