PAR 2.0 compatible file verification and repair tool

This is a simple fork of par2cmdline which replaces core computation routines
with ParPar’s processing backend, improving par2cmdline’s performance on x86/ARM platforms.

Differences with par2cmdline:

par2cmdline-turbo aims to keep close with its upstream and only differs in the
following areas related to performance. As such, the scope of this project covers:

    GF16, MD5 and CRC32 computation, using ParPar’s implementation
    Use ParPar’s internal checksumming to detect RAM errors during GF16 computation
    Adopts ParPar’s stitched hashing approach

par2cmdline is a program for creating and using PAR2 files to detect damage
in data files and repair them if necessary. PAR2 files are usually
published in binary newsgroups on Usenet; they apply the data-recovery
capability concepts of RAID-like systems to the posting and recovery of
multi-part archives.