Allow to set host for NavigateToString

[Aaron-Junker]

Is your feature request related to a problem? Please describe.
If I navigate to a string its web adress is about:blank. If a virtual host has CORS off it can't access resources of this host. And you're not able to set an eventlistener for ResourceRequested, because about:blank is not a http scheme.

Describe the solution you'd like and alternatives you've considered
Add an optional argument to navigateToString that lets you specify what the adress of the webView is.

For example:

webView.NavigateToString(html, "http://host/index.html")

[champnic]

Hey @Aaron-Junker - thanks for the feature request! We are tracking this in #530. We have this work committed for this quarter, so should be starting work on it soon. Thanks!