Add Ed25519ph and Ed25519ctx variants according to RFC-8032 #88
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Improved Ed25519 signature computation by adding two missing variants - Ed25519ph and Ed25519ctx.
Also I have added two new test vectors for it (from the original spec).
Haven't tested it with Arduino, but host version works fine.
Specification: https://datatracker.ietf.org/doc/html/rfc8032
PS thanks for good design! It was quite easy to figure out this lib, compared to 'big' crypto-libraries.