Custom emoji

[nadonomy]

Summary As a user I'd like to upload custom images & gifs to use as emoji in messages and reactions.

Intended outcome Allow users to upload custom emoji. Consider relationship for custom emojis between users, rooms and spaces.

[pharoah-islands]

https://github.com/vector-im/element-web/issues/22322

[pharoah-islands]

Please make this a priority. the deep social context and interaction value that custom emoji reactions bring to discussion are priceless.

[nmscode]

https://github.com/vector-im/element-meta/issues/339#issuecomment-1213520411