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FAO all lovely folks on the #CultOfShiv

I've made some further tweaks to our custom emojis. These are broadly:

- Changing some emoji short codes to make them more descriptive & accessible for people using screen readers.
- Changing the emoji category for the Cult Of Shiv to make it more descriptive.
- Adding new categories for Twemoji & Google Noto Color Emoji.
- Adding some common emojis missing from devices that haven't been updated to unicode 15 emoji.

Love from your emoji mistress