Py7zr

Changed
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* Decryption: performance improvement.
Introduce helpers.calculate_key3(), which utilize list comprehension expression, bytes generation
with join(). It reduces a number of calls of hash library and improve decryption performance.

Changed
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* Extraction: Unlink output file if exist when it become a symbolic link.
When overwrite extracted files and there are symlinks, it may cause an unexpected result.
Unlinking it may help it.

Added
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* Support dereference option of SevenZipFile class. (131)
If dereference is False, add symbolic and hard links to the archive.
If it is True, add the content of the target files to the archive.
This has no effect on systems that do not support symbolic links.
* Introduce progress callback mechanism (130)

Changed
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* CLI: add --verbose option for extraction
* win32: update win32compat

Fixed
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* Fix archiveinfo() for 7zAES archives
* Release variables when close() (129)

Fixed
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* Support extraction of file onto a place where path length is > 260 bytes on Windows 10, Windows Server 2016R2
and later. (Windows Vista, 7 and Windows Server 2012 still have a limitation of path length as a OS spec)(116, 126)

Added
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* Support memory API.(111, 119)
Introduce read(filter) and readall() method for SevenZipFile class.
* Support ZStandard codec compression algorithm for extraction.(124, 125)

Changed
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* Drop pywin32 dependency
* Introduce internal win32compat.py
* Archive: Looking for symbolic link object in the archived list,
and if found, record as relative link.(112, 113, 122)

Removed
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* Revmoed requirements.txt. When you want to install dependencies for development
you can do it with 'pip install -e path/to/py7zr_project'