February in Servo: faster layout, pause and resume scripts, and more!

Servo 0.0.6 brings a large set of improvements to the Rust-based web engine. Key highlights include the first truly incremental box tree layout (reusing cached fragments for floats and independent formatting contexts), pause/resume script execution in the DevTools Debugger, new DOM APIs (Pointer Events, UserActivation, import.meta.resolve()), @property CSS rules, partial iframe lazy loading, and transform-style: preserve-3d. The embedding API gains user stylesheet management, offline build support, and gamepad API rework. Performance work covers shared memory optimization using Arc<Vec<u8>> in single-process mode, async parser improvements that could halve parsing energy, and expanded about:memory reporting. Dozens of layout, DOM, stylesheet, and crash fixes are also included, along with accessibility tree groundwork via AccessKit.