conundrum 0.1.0

Hard-to-misuse crypto primitives with purpose scoping.
Documentation 
pub mod purpose;
pub mod unauth_symm_encr;
pub mod symm_encr;
pub mod asymm_encr;
pub mod signing;
pub mod hashing;

// TODO: remove this once serde_bytes implements it
// taken from https://github.com/serde-rs/bytes/issues/26#issuecomment-902550669
mod serde_bytes_array;

// TODO(safety): make sure secret plaintexts are wrapped in Secret from the secrecy crate