* Functions that are to be moved to //shared/htrutils captured in separate file.
* Move files into new //shared/htutils package
hash_function.go renamed to hashers.go
* Refactor to reference moved methods in new package
- Added import for htrutils to state and stateutil packages
- Update references to imported funcs (append "htrutils.")
- Updated funcs in htrutils to be exported where necessary
* Add tests
