* Introduce portable, endian-clean structures using shifts and masks instead of bitfields * Modernize SCSIExecute with RAII and exceptions * Convert SP-IN calls to use the new portable SCSI structures and functions * Convert SP-OUT code to use the new portable SCSI structures and functions * Delete bitfield-based code and remove runtime endian check Closes: https://github.com/scsitape/stenc/issues/63