xr_sha1 refactoring

Слиты xottab-duty запросил слияние github/fork/kacejot/xd_dev в xd_dev

Created by: kacejot

  • Renamed xr_sha256 to xr_sha1 due to the algorithm it uses.
  • Fixed chunk size in hash calculation. Valid chunk size for SHA1 is 512 bits, not bytes.
  • Performed minor refactoring.