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/MetaData.hs

@@ -129,7 +129,7 @@ cleanup k = do
 	case toJSON' (AddJSONActionItemFields m) of
 		Object o -> maybeShowJSON $ AesonObject o
 		_ -> noop
-	showLongNote $ unlines $ concatMap showmeta $
+	showLongNote $ UnquotedString $ unlines $ concatMap showmeta $
 		map unwrapmeta (fromMetaData m)
 	return True
   where