p384 and Ed25519 Support

Full support for p384: The yubikey module has also been updated so that it will work correctly when you want to sign or create p384 data.

You can now validate certs which use nistp384 OR Ed25519 signatures. Yubikey functionality is not there however since their support for ed25519 is very new and I'm not sure if it's compatible yet. I would also need to make significant modifications to the yubikey_piv upstream library.