* Add outline, flexbox, background clip, attachment, word-wrap, and work-break
  properties to `concentric` `PropertySort` sort order
* Add background clip and attachment properties to `recess` `PropertySort`
  sort order
* Fix `SpaceAfterComment` handling of consecutive comments
* Fix `SpaceBeforeBrace` to check `@if` / `@else` statements
* Fix `ZeroUnit` to not report zero values with units in `calc` expressions
* Fix detection of control comments when `scss-lint:enable` is used
* Fix `Comment` linter message when using `loud` style comments