Show text form of emoji in user full names

[neiljp]

Text forms of emoji/unicode are currently shown in messages and reactions, but if a user happens to have one in their user 'full name' then this is not handled right now. This triggers the behavior where the display can be corrupted by multi-width characters - a bug believed to originate in urwid.

To 'clean' the output of full names it would therefore be good to convert any emoji to the expanded text form, and ideally style it as per emojis to distinguish it from the name itself.

[tushar912]

@neiljp can I work on this

[tushar912]

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[Ezio-Sarthak]

I'd like to work on the issue :)

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