feature: Rework shortcodes to align with the community and support localization.

[milesj]

This has been a rather large topic but I believe we have a path forward.

Solves #49, #51, #52, #53, #57

• Remove shortcodes from existing datasets.
• Remove meta/shortcodes.json dataset.
• Add localized shortcodes based on CLDR annotations.
• Add shortcode presets: emojibase, slack, github, etc.
• Update APIs to merge multiple presets into a single dataset.
• Update regex/shortcode to support locales.

[milesj]

@strixaluco This is ready. Would you be able to test it if I published a pre-release?

[strixaluco]

@milesj Thanks for such a prompt rework. I'll do my best to do the testing.