IRMAseal curve library

This crate has been renamed to pg-curve.

This crate is a fork of the BLS12-381 pairing-friendly elliptic curve construction crate, providing serialisation. This crate is forked because the maintainers of BLS12-381 do not wish to merge the proposed serialisation standard in merge request #12. This crate should be up to date with upstream, with the gt-serialisation branch merged.