Fix build with wai 0.3.0.

This version of wai changed the type of Middleware, so I cannot seem
to liftIO inside it. So, got rid of a lot of not really needed
complexity to use System.Log.Logger's logging stuff, and just use
the standard wai stdout logger when debug logging is enabled.

Format may change some, and it logs http to stdout instead of stderr
now. Doesn't matter for the webapp since both go to the same log anyway.

Assistant/Threads/WebApp.hs

@@ -47,6 +47,8 @@ import Yesod
 import Network.Socket (SockAddr, HostName)
 import Data.Text (pack, unpack)
 import qualified Network.Wai.Handler.WarpTLS as TLS
+import Network.Wai.Middleware.RequestLogger
+import System.Log.Logger
 
 mkYesodDispatch "WebApp" $(parseRoutesFile "Assistant/WebApp/routes")
 
@@ -83,7 +85,7 @@ webAppThread assistantdata urlrenderer noannex cannotrun postfirstrun listenhost
 	setUrlRenderer urlrenderer $ yesodRender webapp (pack "")
 	app <- toWaiAppPlain webapp
 	app' <- ifM debugEnabled
-		( return $ httpDebugLogger app
+		( return $ logStdout app
 		, return app
 		)
 	runWebApp tlssettings listenhost' app' $ \addr -> if noannex
@@ -135,3 +137,9 @@ getTlsSettings = do
 #else
 	return Nothing
 #endif
+
+{- Checks if debugging is actually enabled. -}
+debugEnabled :: IO Bool
+debugEnabled = do
+	l <- getRootLogger
+	return $ getLevel l <= Just DEBUG