* 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
