Let preprardir work with unar too instead of non-free unrar only

https://directory.fsf.org/wiki/Unar
pyrescene: unrar, "e", archive_name, name, dest

unar: unar, archive_name, -o , name
Example: unar rarlnx28.sfx -o DIRNAME rar/rar

unar:
Usage: unar [options] archive [files ...]

Available options:
-output-directory (-o) <string>    The directory to write the contents of the archive to. Defaults to the current directory. If set to a single dash (-), no
                                   files will be created, and all data will be output to stdout.
-force-overwrite (-f)              Always overwrite files when a file to be unpacked already exists on disk. By default, the program asks the user if
                                   possible, otherwise skips the file.
-force-rename (-r)                 Always rename files when a file to be unpacked already exists on disk.
-force-skip (-s)                   Always skip files when a file to be unpacked already exists on disk.
-force-directory (-d)              Always create a containing directory for the contents of the unpacked archive. By default, a directory is created if
                                   there is more than one top-level file or folder.
-no-directory (-D)                 Never create a containing directory for the contents of the unpacked archive.
-password (-p) <string>            The password to use for decrypting protected archives.
-encoding (-e) <encoding name>     The encoding to use for filenames in the archive, when it is not known. If not specified, the program attempts to
                                   auto-detect the encoding used. Use "help" or "list" as the argument to give a listing of all supported encodings.
-password-encoding (-E) <name>     The encoding to use for the password for the archive, when it is not known. If not specified, then either the encoding
                                   given by the -encoding option or the auto-detected encoding is used.
-indexes (-i)                      Instead of specifying the files to unpack as filenames or wildcard patterns, specify them as indexes, as output by lsar.
-no-recursion (-nr)                Do not attempt to extract archives contained in other archives. For instance, when unpacking a .tar.gz file, only unpack
                                   the .gz file and not its contents.
-copy-time (-t)                    Copy the file modification time from the archive file to the containing directory, if one is created.
-forks (-k) <visible|hidden|skip>  How to handle Mac OS resource forks. "visible" creates AppleDouble files with the extension ".rsrc", "hidden" creates
                                   AppleDouble files with the prefix "._", and "skip" discards all resource forks. Defaults to "visible".
-quiet (-q)                        Run in quiet mode.
-version (-v)                      Print version and exit.
-help (-h)                         Display this information.


man unar:
NAME
       unar - extract archive file contents

SYNOPSIS
       unar [OPTION]... ARCHIVE [FILE]...

DESCRIPTION
       Extract FILEs or the contents of ARCHIVE.

OPTIONS
       -o, -output-directory DIRECTORY
              The directory to write the contents of the archive to.  Defaults to the current directory.

       -f, -force-overwrite
              Always  overwrite  files  when a file to be unpacked already exists on disk.  By default, the program asks the user if possible, otherwise
              skips the file.

       -r, -force-rename
              Always rename files when a file to be unpacked already exists on disk.

       -s, -force-skip
              Always skip files when a file to be unpacked already exists on disk.

       -d, -force-directory
              Always create a containing directory for the contents of the unpacked archive.  By default, a directory is created if there is  more  than
              one top-level file or folder.

       -D, -no-directory
              Never create a containing directory for the contents of the unpacked archive.

       -p, -password PASSWORD
              The password to use for decrypting protected archives.

       -e, -encoding ENCODING
              The  encoding to use for filenames in the archive, when it is not known.  If not specified, the program attempts to auto-detect the encod‐
              ing used.  Use "help" or "list" as the argument to give a listing of all supported encodings.

       -E, -password-encoding ENCODING
              The encoding to use for the password for the archive, when it is not known.  If not specified, then  either  the  encoding  given  by  the
              -encoding option or the auto-detected encoding is used.

       -i, -indexes
              Instead of specifying the files to list as filenames or wildcard patterns, specify them as indexes, as output by lsar.

       -nr, -no-recursion
              Do not attempt to extract archives contained in other archives. For instance, when unpacking a .tar.gz file, only unpack the .tar file and
              not its contents.

       -t, -copy-time
              Copy the file modification time from the archive file to the containing directory, if one is created.

       -k, -forks visible|hidden|skip
              How to handle Mac OS resource forks.  visible creates AppleDouble files with the extension ".rsrc", hidden creates AppleDouble files  with
              the prefix "._", and skip discards all resource forks.  Defaults to visible.

       -q, -quiet
              Run in quiet mode.

       -h, -help
              Display help information.
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