Use GhcModT everywhere and remove the GhcMod alias

Not doing this makes having GhcModT pretty pointless as users of the
library wouldn't be able to use custom inner monads as evey function for
dealing with GhcModT's would be constraint to (GhcModT IO) thus only
allowing IO as the inner monad.

Language/Haskell/GhcMod/Info.hs

@@ -21,9 +21,10 @@ import Language.Haskell.GhcMod.Convert
 ----------------------------------------------------------------
 
 -- | Obtaining information of a target expression. (GHCi's info:)
-info :: FilePath     -- ^ A target file.
+info :: IOish m
+     => FilePath     -- ^ A target file.
      -> Expression   -- ^ A Haskell expression.
-     -> GhcMod String
+     -> GhcModT m String
 info file expr = do
     opt <- options
     convert opt <$> ghandle handler body
@@ -36,10 +37,11 @@ info file expr = do
 ----------------------------------------------------------------
 
 -- | Obtaining type of a target expression. (GHCi's type:)
-types :: FilePath     -- ^ A target file.
+types :: IOish m
+      => FilePath     -- ^ A target file.
       -> Int          -- ^ Line number.
       -> Int          -- ^ Column number.
-      -> GhcMod String
+      -> GhcModT m String
 types file lineNo colNo = do
     opt <- options
     convert opt <$> ghandle handler body