Sandwich new Monad layer GmOutT into transformer stack

This way we can have access to some options pre Cradle setup which
should fix the output interleaving problems I was observing.

test/CabalHelperSpec.hs

@@ -61,7 +61,7 @@ spec = do
             let tdir = "test/data/stack-project"
             [ghcOpts] <- map gmcGhcOpts . filter ((==ChExeName "new-template-exe") . gmcName) <$> runD' tdir getComponents
             let pkgs = pkgOptions ghcOpts
-            pkgs `shouldBe` ["base", "bytestring"]
+            sort pkgs `shouldBe` ["base", "bytestring"]
 
         it "extracts build dependencies" $ do
             let tdir = "test/data/cabal-project"