Derive `Clone` for `Aseprite` (and potentially other types)

[CMorrison82z]

See title.

[makspll]

Reflect would be useful too

[Lommix]

Reflect, sure. But clone, why? It is meant to be immutable data with a single source of truth. It is not meant to be cloned by design.
But I don't want to force my patterns onto you. If you can give me a good reason for clone, I'll accept a PR.

If you want to reflect now, make a PR. Else you have to wait for the next bevy release cycle.