Make derive macros work outside of rune

[ModProg]

Make derive macros work outside rune such as derive(Parse). To do this one can use either https://docs.rs/proc-macro-crate/latest/proc_macro_crate/ directly or a more complicated approach like here: https://github.com/khonsulabs/bonsaidb/blob/448db4d32ea065aa39b1c4731c0e5b9d5ffce83b/crates/bonsaidb-macros/src/lib.rs#L35-L61 to get more control about it.

[udoprog]

From #531, what is the specific problem you're having?

[udoprog]

Ah, is it that the Parse, Spanned, ... macros use crate:: as a prefix? This can be fixed by:

• Changing the context to now not use the with_crate constructor - then it will use rune:: instead.
• Re-export pub(crate) use crate as rune in the ast::prelude.

That should cover the vast majority of uses for those derives.

[ModProg]

* Changing the context to now use the `with_crate` constructor - then it will use `rune::` instead.

you mean to not use it? because with_crate is the issue, it makes the context use crate:: or do you mean update with_crate to use rune::?

[udoprog]

Right, s/now/not!