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Typeable has been automatically derived for every type since GHC 7.10,
so remove these obsolete derivations. This also allows us to get rid of
the `DeriveDataTypeable` pragma quite naturally.
Related: https://github.com/xmonad/xmonad/pull/299 (xmonad/xmonad@9e5b16ed8a)
Related: bd5b969d9b
Fixes: https://github.com/xmonad/xmonad-contrib/issues/548