Get rid of unused imports

Starting with 5240116f3c we only support
GHC versions 8.4.4 and up (more precisely, the GHC version associated
with stackage lts-12 and up).  The imports in question are now in
Prelude and need not be imported explicitly.

XMonad/Util/Font.hs

@@ -35,10 +35,8 @@ module XMonad.Util.Font
 
 import XMonad
 import Foreign
-import Control.Applicative
 import Control.Exception as E
 import Data.Maybe
-import Data.Bits (shiftR)
 import Text.Printf (printf)
 
 #ifdef XFT

XMonad/Util/Invisible.hs

@@ -22,7 +22,6 @@ module XMonad.Util.Invisible (
                             , fromIMaybe
                             ) where
 
-import Control.Applicative
 import Control.Monad.Fail
 
 -- $usage

XMonad/Util/Loggers.hs

@@ -53,7 +53,6 @@ import XMonad.Util.NamedWindows (getName)
 import Control.Exception as E
 import Data.List (isPrefixOf, isSuffixOf)
 import Data.Maybe (fromMaybe)
-import Data.Traversable (traverse)
 import System.Directory (getDirectoryContents)
 import System.IO
 import System.Locale

XMonad/Util/PureX.hs

@@ -58,7 +58,7 @@ import Control.Monad.State
 import Control.Monad.Reader
 
 -- base
-import Data.Semigroup (Semigroup(..), Any(..))
+import Data.Semigroup (Any(..))
 import Control.Applicative (liftA2)
 
 -- }}}

XMonad/Util/RemoteWindows.hs

@@ -38,7 +38,6 @@ module XMonad.Util.RemoteWindows
 
 import XMonad
 import XMonad.Util.WindowProperties
-import Data.Monoid
 import Data.Maybe
 import Control.Monad
 import System.Posix.Env

XMonad/Util/Timer.hs

@@ -20,7 +20,6 @@ module XMonad.Util.Timer
     ) where
 
 import XMonad
-import Control.Applicative
 import Control.Concurrent
 import Data.Unique
 

XMonad/Util/WorkspaceCompare.hs

@@ -27,7 +27,6 @@ import XMonad
 import qualified XMonad.StackSet as S
 import Data.List
 import Data.Maybe
-import Data.Monoid (mconcat)
 import XMonad.Actions.PhysicalScreens (ScreenComparator(ScreenComparator), getScreenIdAndRectangle, screenComparatorById)
 import Data.Function (on)