Filter RTL unicode characters out

Gajim sends \u200E and \u200F for RTL.
It is planned that Gajim stops doing this and uses some GTK feature to
get the same result.

However users expressed the whish that we filter out such characters in
incoming messages before displaying them to make Profanity more robust.

I'm still not sure whether I like the solution because it means a lot of
allocating/deallocating upon every new message.

Fix https://github.com/profanity-im/profanity/issues/1220

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