Update for latest HTML/URL changes

[domenic]

URLUtils is basically dead. Although url.spec.whatwg.org still needs to be updated for the URL constructor.

• Merge URLUtils into Location: whatwg/html@f0a7365
• Inline URLUtils for a and area elements: whatwg/html@bab6591

As you can see from this commits (or the corresponding spec sections) whatwg-url will need to expose things like basicURLParse(urlObject, stateOverride), or setUsername(urlObject, value), or serializeHost(host), or... Might be best to write the jsdom patch first then see what APIs it needs.