Add a derive macro for Prism

[jplatte]

cc @xarvic 🙂

[jplatte]

That was the last force-push, testing whether existing where clauses or duplicate Clone predicates cause any issues (they don't seem to!).

[jplatte]

We should make sure we use the same versions, so users don't have to build them twice.

Cargo.toml dep versions aren't exact by degault. Virtually everything uses syn & quote 1.x.y, so only one will be compiled.

[richard-uk1]

We should make sure we use the same versions, so users don't have to build them twice.

Cargo.toml dep versions aren't exact by degault. Virtually everything uses syn & quote 1.x.y, so only one will be compiled.

Yes sorry was more just thinking out loud. I don't expect it to be an issue.

[jplatte]

Fixed the panic message and did some other refactorings, ready for another review :)

[xarvic]

This is awesome! @jplatte, thank you so much :)

[jplatte]

@Maan2003 can this be merged? :)

[maan2003]

Sure!