* Refactor list of emoji requiring added outlines so that it can be theme-specific
* Split inaccessible emoji to emoji requiring an outline and ones that can be inverted
* Drop the “silouhettes” from black emoji as they seem to have changed color
* Add inaccessible emojis list for the light theme
* Use bordered emoji variant instead of unreliable CSS
Mastodon converts all Emoji to images, whether they have a VS15 after
them or not, but leaves the VS15 in the string, which is displayed as
a black box in Safari.
* Update to emojimart 2.6.1
WIP using local updated version. Sheet comes from emoji-data@4.0.4,
file sheet_twitter_32_indexed_256.png.
* Update to 2.6.1 and uncompress data if needed
* Remove changes that were not needed
* Fix yarn lock file
* Match emojiToShowFilter behavior to new version of emoji-mart
* Fix codeclimate issue
* Match custom emoji behavior to new version of emoji-mart
* Replace emoji without shortcode in tests
* Fix code climate issues
