[Freemoji] Allow saving emojis other people send from servers you're not in

[hiddeninthesand]

Is your feature request related to a problem? Please describe.

Not necessarily a problem, just a feature that this plugin could provide, since Discord most likely won't anytime soon.

Describe the solution you'd like

Have a local store of emojis that can be saved to, almost like GIF favoriting.

Describe alternatives you've considered

Using image favoriting, or manually downloading and recreating in a server I own. These are awful alternatives.

Additional context
Add any other context or screenshots about the feature request here.