Package hashable - Namespaces

• Data.Hashable
• Data.Hashable.SipHash

  SipHash24 copied from C [reference implementation](https://github.com/veorq/SipHash/blob/master/siphash.c)
• Data.Hashable.SipHashV2

  SipHash24 copied from C [reference implementation](https://github.com/veorq/SipHash/blob/master/siphash.c) and rust https://doc.rust-lang.org/src/core/hash/sip.rs.html