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/Check.hs

@@ -15,8 +15,9 @@ import Language.Haskell.GhcMod.Monad
 
 -- | Checking syntax of a target file using GHC.
 --   Warnings and errors are returned.
-checkSyntax :: [FilePath]  -- ^ The target files.
-            -> GhcMod String
+checkSyntax :: IOish m
+            => [FilePath]  -- ^ The target files.
+            -> GhcModT m String
 checkSyntax [] = return ""
 checkSyntax files = withErrorHandler sessionName $ do
     either id id <$> check files
@@ -29,8 +30,9 @@ checkSyntax files = withErrorHandler sessionName $ do
 
 -- | Checking syntax of a target file using GHC.
 --   Warnings and errors are returned.
-check :: [FilePath]  -- ^ The target files.
-      -> GhcMod (Either String String)
+check :: IOish m
+      => [FilePath]  -- ^ The target files.
+      -> GhcModT m (Either String String)
 check fileNames = do
   withLogger setAllWaringFlags $ do
     setTargetFiles fileNames
@@ -38,8 +40,9 @@ check fileNames = do
 ----------------------------------------------------------------
 
 -- | Expanding Haskell Template.
-expandTemplate :: [FilePath]  -- ^ The target files.
-               -> GhcMod String
+expandTemplate :: IOish m
+               => [FilePath]  -- ^ The target files.
+               -> GhcModT m String
 expandTemplate [] = return ""
 expandTemplate files = withErrorHandler sessionName $ do
     either id id <$> expand files
@@ -51,7 +54,8 @@ expandTemplate files = withErrorHandler sessionName $ do
 ----------------------------------------------------------------
 
 -- | Expanding Haskell Template.
-expand :: [FilePath]  -- ^ The target files.
-      -> GhcMod (Either String String)
+expand :: IOish m
+       => [FilePath]  -- ^ The target files.
+       -> GhcModT m (Either String String)
 expand fileNames = withLogger (Gap.setDumpSplices . setNoWaringFlags) $
     setTargetFiles fileNames