feat: replace emoji with SVGs (#129)

[cyberalien]

Replaces emojis with SVGs.

Emoji sets can be replaced by changing dependency in config/emoji.ts.

Currently available emoji sets:

• @iconify-emoji/twemoji - Twitter Emoji, used by default
• @iconify-emoji/openmoji - OpenMoji
• @iconify-emoji/noto - Noto Emoji by Google
• @iconify-emoji/fluent-emoji-flat - Fluent Emoji (only "Flat" version for now) by Microsoft

To switch set, install appropriate package as dependency, change it in config/emoji.ts and run prepare script that will copy all files.

Emojis are copied to public/emojis/${prefix}/, which is ignored in .gitignore.

There probably are bugs, creation of various emoji packages is not automated yet.

[stackblitz]

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[cyberalien]

Bugs:

• Posting several emojis in sequence without spaces sometimes does not replace all emojis
• Editing post with replaced emojis fails to convert emojis back to text

[cyberalien]

Fixed first bug in a dependency.

[cyberalien]

Fixed issue with editing drafts. So I think this is usable now. No bugs that I can see.

Switching emoji sets for now requires changing dependency, in future I want to create an easy to use workflow that would allow quickly changing emoji set without much effort, add/replace custom emoji (unicode emojis, not :whatever: "emojis", though code has some support for that syntax too).

[cyberalien]

Fixed #667

Old code failed at this sequence, which was mentioned in another issue:

👦🏾 👧🏾 👨🏾 👩🏾 👴🏾 👵🏾 👶🏾 👱🏾 👮🏾 👲🏾 👳🏾 👷🏾 👸🏾 💂🏾 🎅🏾 👼🏾 💆🏾 💇🏾 👰🏾 🙍🏾 🙎🏾 🙅🏾 🙆🏾 💁🏾 🙋🏾 🙇🏾 🙌🏾 🙏🏾 🚶🏾 🏃🏾 💃🏾 💪🏾 👈🏾 👉🏾 ☝️🏾 👆🏾👇🏾 ✌️🏾 🖖🏾 ✊🏾 ✋🏾 👊🏾 👌🏾 👍🏾 👎🏾 👋🏾 👏🏾 👐🏾 💅🏾 👂🏾 👃🏾 🚣🏾 🛀🏾 🏄🏾 🏇🏾 🏊🏾 🚴🏾 🚵🏾

GitHub seems to fail at parsing it too, click button to quote this reply to see correct emoji as raw text without GitHub replacement.

[antfu]

This is awesome! Thanks a lot for your effort! 🔥

I will figure out how to replace the ones on EmojiMarket later.