General improvements (#250)

* Remove unnecessary constraints on hash

* Remove unnecessary `Result` on `KeyPair::generate_random`

* Fix de-serialization issue on `Ke1State`

* Fix rustfmt

* Remove allocations in `envelope`

* Run Clippy for tests and rustdoc lints too

* Fix `Debug` implementation

* Fix missing constraints on `ClientRegistration`

* Fix de-serialization

* Pin temporary dependency

* Update dependencies

* Replace macro with derive-where

* Remove unnecessary installation of Rust components

* Improve macro naming

* Implement `Copy`, `Debug`, `Ord` and `PartialOrd` for high-level items

* Add `rust-version` field to `Cargo.toml`

* Remove unnecessary allocations

* Fix MSRV

* Fix no_std

* Remove unnecessary allocations

* Remove unnecessary allocations

* Not importing items from voprf helps readability

* Fix rustdoc

* Remove unnecessary allocations

* Remove unnecessary allocations

* Replace `Vec` from `diffie_hellman` with `GenericArray`

* Remove unnecessary allocations

* Remove unnecessary allocations

* Remove `cfg(feature = bench)` guard for `missing_docs`

* Fix documentation

* Remove all remaining allocations from `KeyExchange`

* Improve type-safety

* Remove all remaining allocations in `keypair`

* Remove last remaining allocations except `NonVerifiableClient` input

* Remove base64 encoding in Serde implementation

* Remove unnecessary Serde `alloc` feature

* Make curve25519-dalek optional

* Rename `serialize` crate feature to `serde`

* Switch `KeGroup` implementations to higher-level libraries

- Fixes missing clamping in X25519
- X25519 is now a separate crate feature

* Fix typo

src/errors.rs

@@ -14,7 +14,7 @@ use std::error::Error;
 use displaydoc::Display;
 
 /// Represents an error in the manipulation of internal cryptographic data
-#[derive(Clone, Display, Eq, Hash, PartialEq)]
+#[derive(Clone, Copy, Display, Eq, Hash, Ord, PartialEq, PartialOrd)]
 pub enum InternalError<T = Infallible> {
     /// Custom [`SecretKey`](crate::keypair::SecretKey) error type
     Custom(T),
@@ -129,7 +129,7 @@ impl From<voprf::errors::InternalError> for ProtocolError {
 }
 
 /// Represents an error in protocol handling
-#[derive(Clone, Display, Eq, Hash, PartialEq)]
+#[derive(Clone, Copy, Display, Eq, Hash, Ord, PartialEq, PartialOrd)]
 pub enum ProtocolError<T = Infallible> {
     /// Internal error encountered
     LibraryError(InternalError<T>),