v21.7.30

This is a minor release with several bug fixes, major performance improvements
and support for new and improved package formats

WARNING: the app installatiom does not work on Windows. Everything else is fine. Use the next version v21.8.1 and later. See #2610

Many thanks to every contributors that made this possible and in particular:

• Abhigya Verma @abhi27-web
• Ayan Sinha Mahapatra @AyanSinhaMahapatra
• Dennis Clark @DennisClark
• Jono Yang @JonoYang
• Mayur Agarwal @mrmayurgithub
• Philippe Ombredanne @pombredanne
• Pierre Tardy @tardyp

Key changes:

Outputs:

• Add new YAML-formatted output. This is exactly the same data structure as for
  the JSON output
• Add new Debian machine readable copyright output.
• The CSV output "Resource" column has been renamed to "path".
• The SPDX output now has the mandatory DocumentNamespace attribute per SPDX specs #2344

Copyright detection:

• The copyright detection speed has been significantly improved with the tests
  taking roughly 1/2 of the time to run. This is achieved mostly by replacing
  NLTK with a the minimal and simplified subset we need in a new library named
  pygmars.

License detection:

• Add new licenses: now tracking 1763 licenses
• Add new license detection rules: now tracking 29475 license detection rules
• We have also improved license expression parsing and processing

Package detection:

• The Debian packages declared license detection has been significantly improved.
• The Alpine packages declared license detection has been significantly improved.
• There is new support for shell parsing and Alpine packages APKBUILD data collection.
• There is new support for various Windows packages detection using multiple
  techniques including MSI, Windows registry and several more.
• There is new support for Distroless Debian-like installed packages.
• There is new support for Dart Pub package manifests.