web-api-cat 0.6.6

Bindings between boa-cat (JS engine) and the DOM (html-cat tree) plus fetch (net-cat). v0.6.6 adds `Element.cloneNode(deep)` -- shallow by default, recursive when `deep === true`. The clone owns fresh `__attributes`, `style`, `children`, and `classList` (with backref retargeted to the new element id) plus a freshly-installed `innerHTML` accessor, so mutating the clone never bleeds back into the original. Seventh sub-crate of a Servo-replacement webview runtime targeting Tauri.