filter out control characters in all other Messages

This does, as a side effect, make long notes in json output not
be indented. The indentation is only needed to offset them
underneath the display of the file they apply to, so that's ok.

Sponsored-by: Brock Spratlen on Patreon

Command/Get.hs

@@ -93,7 +93,7 @@ getKey' :: Key -> AssociatedFile -> [Remote] -> Annex Bool
 getKey' key afile = dispatch
   where
 	dispatch [] = do
-		showNote "not available"
+		showNote (UnquotedString "not available")
 		showlocs []
 		return False
 	dispatch remotes = notifyTransfer Download afile $ \witness -> do
@@ -116,6 +116,6 @@ getKey' key afile = dispatch
 			either (const False) id <$> Remote.hasKey r key
 		| otherwise = return True
 	docopy r witness = do
-		showAction $ "from " ++ Remote.name r
+		showAction $ UnquotedString $ "from " ++ Remote.name r
 		logStatusAfter key $
 			download r key afile stdRetry witness