Add support for modern CSS at-rules @layer, @scope, and @starting-style#1549

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MyIntervals:mainMyIntervals/PHP-CSS-Parser:mainfrom

samuil-banti-wpenigne:add-support-for-at-rules-layer-scope-and-starting-stylesamuil-banti-wpenigne/PHP-CSS-Parser:add-support-for-at-rules-layer-scope-and-starting-styleCopy head branch name to clipboard