Convert Unicode standard emojis to selected emoji set

[sam (Sam Saffron)]

Dupe of

Auto-replace emoji like with Discourse codes

Over on TDWTF, I’ve been using a bot to automatically replace Unicode emoji like with Discourse emoji codes like ; it’s useful when posting from mobile. @codinghorror suggests it could be made a Discourse feature; it never occurred to me before, but it does sound like it’d be useful. That way it could also work in PMs, which is something I haven’t got working in my bot yet.