* Move `elliptic-curve` implementation to points to allow `Zeroize`
* Simplify `Ristretto255::random_scalar` implementation
* Fix `Ristretto255` deserialization
* Remove unnecessary check in `Ristretto255::random_scalar`
* Base `X25519` implementation on `curve25519-dalek`
* Constrain public and secret key to `Copy`
* Replace manual `ZeroizeOnDrop` implementation with `derive`
* Update dependencies
* Add `warn(unused_crate_dependencies)`
* Sync crate feature naming with `voprf`
* Remove unnecessary dependency crate features
* Never produce a zero scalar
* Rename `OprfGroup` to `OprfCs`
* Rename `TripleDH` to `TripleDh`
* Remove `slow-hash` crate feature
* Rename `NoOpHash` to `Identity`
* Rename `SlowHash` to `Ksf`
* Move `KeyExchange` type definitions down
* Deserialize secret and public keys from slices
* Remove `PrivateKey::from_bytes`
* Rename `From/ToBytes` to `De/Serialize`
* Re-export `serde_` as `serde`
* Custom `De/Serialize` implementation for keys
* Remove custom `De/Serialize` implementation
* Run Taplo v0.6
