Fix auto-shortcode emoji
Emoji were broken due to `Pleroma.Formatter` not knowing about the auto-shortcode emoji. This moves that logic from `Pleroma.Web.TwitterAPI.UtilController` to `Pleroma.Formatter`. Additionally, it's now possible to specify multiple shortcode globs, and the default globs were changed to `["/emoji/custom/**/*.png"]`, since that's in the .gitignore and the files there would have to be shortcode emoji anyway.
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