v1.2.0

Major changes:

• New 'west grep' command for running a "grep tool" in your west workspace's
  repositories. Currently, 'git grep', 'ripgrep', and standard 'grep' are
  supported grep tools.

  To run this command to get 'git grep foo' results from all cloned,
  active repositories, run:

  west grep foo

  For more details, run 'west help grep'.

Other changes:

• The manifest file format now supports a 'description' field in each
  'projects:' element.

• 'west list --format' now accepts '{description}' in the format
  string, which prints the project's 'description:' value.

• 'west compare' now always prints information about
  the manifest-rev branch

Bug fixes:

• 'west init' aborts if the destination directory already exists.

API changes:

• 'west.commands.WestCommand' methods 'check_call()' and
  'check_output()' now take any kwargs that can be passed on
  to the underlying subprocess function.

• 'west.commands.WestCommand.run_subprocess()': new wrapper
  around 'subprocess.run()'. This could not be named 'run()'
  because 'WestCommand' already had a method by this name.

• 'west.commands.WestCommand' methods 'dbg()', 'inf()',
  'wrn()', and 'err()' now all take an 'end' kwarg, which
  is passed on to the call to 'print()'.

• 'west.manifest.Project' now has a 'description' attribute,
  which contains the parsed value of the 'description:' field
  in the manifest data.