Release v4.4.0

[puckowski]

What:

Update files for Release/v4.4.0.
Performed steps from comment on #4237:

• Create a branch from master release/v4.4.0
• Bump the Less version. (Unfortunately, this is still clunky, it's changed at package.json in root, and in /packages/less/ for historical reasons)
• Update the Changelog
• Run grunt dist - (Also clunky -- in a perfect world, we would not be committing dist files, but there are also tricky backwards compatibility problems which caused this initially.)
• Commit changed files to branch.
• Submit a PR to this repo.

Also tried to mirror #3814

I figured the addition of formal @layer support warranted a minor release.

Why:

Users can benefit from layer at-rule support.

Checklist:

• Documentation
• Added/updated unit tests
• Code complete

[puckowski]

Ideally we merge #4344 before merging this release PR to resolve more issues in the short term.

We can build upon #4344 at a later time if we decide we want to calculate final values for color operands.

[puckowski]

@matthew-dean

Ideally we merge #4344 before merging this release PR to resolve more issues in the short term.

We can build upon #4344 at a later time if we decide we want to calculate final values for color operands.

Please take a look when you have a moment.

[matthew-dean]

Could you add tests for #4344 ? Thanks!

[puckowski]

@matthew-dean

I updated the release PR to include #4346 which was recently merged.

[puckowski]

Release available on GitHub at https://github.com/less/less.js/releases/tag/v4.4.0

I tested lessc and the browser bundle off a fresh npm install and seems working as expected.