[Feature] Message editing/deletion

[Nidoskull]

This is a parity thing.
PluralKit allows you to edit proxied messages by running a command. Revolt allows you to edit your own messages. RevoltKit should, therefore, probably allow for the same.

Default behavior for this should be

Proxied message: This is a message!
rk;edit Message Editing
Proxied message: Message Editing

This should take the following flags, if at all possible:

• -append will instead add to the end of the message, with a space between the new and the old text. Proxied message: This is a message! Message Editing
• -prepend will instead add to the start of the message, with a space between the new and the old text. Proxied message: Message Editing This is a message!
• -nospace does nothing on its own, but if included with -prepend or -append will prevent adding the space between new and old message content.
• -clear-embeds removes embeds from a message (finds links and puts <> around them)
• -clear-attachments removes attachments from a message
• -regex allows using Regex editing (this is a power user thing I'd very much get not implementing this one tbh)