- gl_emoji for falling back to image/css-sprite when the browser
   doesn't support an emoji
 - Markdown rendering (Banzai filter)
 - Autocomplete
 - Award emoji menu
    - Perceived perf
    - Immediate response because we now build client-side
 - Update `digests.json` generation in gemojione rake task to be more
   useful and  include `unicodeVersion`

MR: !9437

See issues

 - #26371
 - #27250
 - #22474

No reason to split it into a separate gem when the gem barely did anything. We can use gemojione directly, making updating gemojione that much easier.

Also fix the Rake task and update gemojione to 2.6.1. This adds the EmojiOne Spring update.

Changelog: https://github.com/jonathanwiesel/gemojione/blob/master/CHANGELOG.md

We're trying to avoid circular dependency errors.

Now that we're serving assets directly from the Gemojione gem's path,
the images are not in an `emoji/` sub-folder.

Closes #1477