This crate provides a derive macro for the `BFieldCodec` trait.
The macro emits statements starting with:
`use crate::twenty_first::`
Crates that use this macro must add a use statement `twenty_first`
in their lib.rs:
`use twenty_first;`
or if using twenty-first via re-export in `dep_crate`:
`use dep_crate::twenty_first;`
Failure to do so will result in compile errors.