Support multiple shortcode presets

[milesj]

There is no standard for shortcodes (:smile:), so every website/platform (Slack, GitHub, etc) have different implementations. Furthermore, emojibase implements its own version (since there is no standard to reference from), which results in common emojis having different shortcodes (people don't like this).

Ideally I would like to support shortcode presets from multiple sources, but I'm not entire sure where I could get this information. In an ideal world, it would look like the following:

• Remove shortcodes from all emojibase-data.
• Add new emojibase-data/shortcodes/*.json datasets that map hexcodes to an array of custom shortcodes for each emoji.
• Have the consumer load and stitch them together.

[gavinr]

Follow-up or example for this:

The popular https://github.com/iamcal/js-emoji library uses https://github.com/iamcal/emoji-data. Their shortcodes can be seen here and the source is here (see short_name property). Note that these are different than the shortcodes in this repository.

I'm not saying which is right or wrong, but I'll echo that as a user it's annoying and would be great if places could start to standardize. Thanks for the hard work!

[milesj]

Supported in the next major.