Native Go version of HighwayHash with optimized assembly implementations on Intel and ARM. Able to process over 10 GB/sec on a single core on Intel CPUs - https://en.wikipedia.org/wiki/HighwayHash
Issue #17 - on arm64 (on Go 1.16) wrong hash values got computed due to incorrectly naming asm constants like regular Go functions. This probably confused the linker and caused the arm64 implementation to compute incorrect hash values. Fixed by 08ce0b4