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* bump lightningcss * use `lightningcss` in the main PostCss Plugin * use lightningcss in our custom matchers Now that we are using `lightningcss` and nesting in the new `oxide` engine, the generated output _will_ be different in the majority of test cases. Using a combination of `prettier` and `lightningcss` will make the output consistent. The moment we are fully using the `oxide` engine, we can drop `lightningcss` or `prettier` again to improve the performance of the tests. * update tests to apply `lightningcss` related changes * update changelog * add `lightningcss` and `browserslist` as dev dependencies to stable package.json * only use `lightningcss` in tests (without prettier) We will only fallback to prettier if lightningcss fails somehow. * apply side effect chagnes due to only using lightningcss for tests * make CI happy (integration tests) Apply changes to integration tests now that we are using lightningcss * transform `lightningcss` for Node 12 when running tests * run prettier on failing tests for `toMatchFormattedCss` This will result in better diffs because diffs are typically per block and/or per line. But lightningcss will simplify certain selectors and the diff won't be as clear. We will only apply the prettier formatting for failing tests in the diff view so that diffs are cleaner and we don't pay for the additional prettier calls when tests pass.