Add ZIP 32 Arbitrary Key derivation

[str4d]

Includes the FFI 0.11.0 build with its associated changes.

Author

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[daira]

utACK with blocking comments.

[daira]

utACK

[nuttycom]

utACK 1a92461

[daira]

Post-hoc ACK 1a92461. I did not check the test vectors, only the test code.