Switch from EmojiOne to Twemoji, different emoji picker (#5046)

* Switch from EmojiOne to Twemoji, different emoji picker

* Make emoji-mart use a local spritesheet

* Fix emojify test

* yarn manage:translations

app/javascript/mastodon/features/ui/util/async-components.js

@@ -1,5 +1,5 @@
 export function EmojiPicker () {
-  return import(/* webpackChunkName: "emojione_picker" */'emojione-picker');
+  return import(/* webpackChunkName: "emoji_picker" */'emoji-mart');
 }
 
 export function Compose () {