Support working with ed25519 seeds in addition to raw keypairs. #1046
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Our ed25519 library uses a representation of its key pair that is incompatible with most modern implementations, which usually work with the original 32-byte seed; Peters' impentation represents the private key as the clamped sha512 of the seed. This change: - preserves the original seed when generating keys - adds CLI commands to obtain the seed via `get prv.seed`, under the same conditions as `get prv.key` is allowed - adds support for `set prv.key` to supply a seed, in which case the keypair will be re-generated from it. This is mostly to enable external key management using modern libraries, but could also be of use on devices where we don't have a trustworthy entropy source. I split Identity::writeTo(uint8_t*,size_t) into explicit forms for the thing being written; the original implementation wrote a different thing depending on the length, which would be ambiguous between pubkey and seed and cumbersome if it tried to return all three in one long buffer. Identity::readFrom() did not have that ambiguity problem because keys can't be set from pubkey alone, though it might be preferable to split readFrom() up as well and not use magic length values.
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This is the same as #1045 but for the dev branch, since the README requested PRs against dev.
Original PR text:
Addresses issue #1044.
get prv.seedCLI to obtain itset prv.seedto generate a new keypair from a seed chosen off-node (could be useful for devices without reliable entropy)