Extract phar archives

[pombredanne]

These are used with PHP, for instance with composer.

[pombredanne]

See specs at:

• https://www.php.net/manual/en/phar.fileformat.php
• https://www.php.net/manual/en/phar.fileformat.stub.php
• https://www.php.net/manual/en/phar.fileformat.phar.php

This may be a some useful code:

• http://formats.kaitai.io/phar_without_stub/index.html
• https://github.com/kaitai-io/kaitai_struct_formats/blob/master/archive/phar_without_stub.ksy
• https://github.com/kaitai-io/formats-kaitai-io.github.io/blob/93d928642e220d5087215210c880db97eca79932/phar_without_stub/src/python/phar_without_stub.py
• https://github.com/Mahlet-Inc/hobbits/blob/81ae2435834d36eed5493aefe52d64409e6bf947/src/hobbits-plugins/analyzers/KaitaiStruct/ksy_py/archive/phar_without_stub.py#L14