Implement tar extraction for multifile mode

[tempusfrangit]

To support tar extraction when running a manifest download, we need to detect tar files. With the addtion of the decompression code paths we can handle a number of tar types. If -x is specified and the file's extension matches a known tar extension, perform the extraction steps.

Known tar types: .tar, .tar.gz, .tgz, .tar.bzip2, .tbz, .tbz2, .tar.xz, .txz, .tar.Z

Closes: #103