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.

test/TestUtils.hs

@@ -12,14 +12,14 @@ module TestUtils (
 import Language.Haskell.GhcMod.Monad
 import Language.Haskell.GhcMod.Types
 
-isolateCradle :: GhcMod a -> GhcMod a
+isolateCradle :: IOish m => GhcModT m a -> GhcModT m a
 isolateCradle action =
     local modifyEnv  $ action
  where
     modifyEnv e = e { gmCradle = (gmCradle e) { cradlePkgDbStack = [GlobalDb] } }
 
-runIsolatedGhcMod :: Options -> GhcMod a -> IO a
-runIsolatedGhcMod opt action = runGhcMod opt $ isolateCradle action
+runIsolatedGhcMod :: Options -> GhcModT IO a -> IO a
+runIsolatedGhcMod opt action = runGhcModT opt $ isolateCradle action
 
 -- | Run GhcMod in isolated cradle with default options
 runID = runIsolatedGhcMod defaultOptions
@@ -28,7 +28,9 @@ runID = runIsolatedGhcMod defaultOptions
 runI = runIsolatedGhcMod
 
 -- | Run GhcMod
-run = runGhcMod
+run :: Options -> GhcModT IO a -> IO a
+run = runGhcModT
 
 -- | Run GhcMod with default options
-runD = runGhcMod defaultOptions
+runD :: GhcModT IO a -> IO a
+runD = runGhcModT defaultOptions