Make blocking scripts detectable, similar to Safari's behavior

[iccub]

To see what I mean, disable javascript in Safari(advanced options in settings)
and look at results of google search and twitter

Brave with javascript blocked

Safari with javascript blocked

As you can see websites can see that Safari has javascript blocked and tries to server non-javascript friendly websites.

We need to research whether it is possible to do in WKWebView. Implementing this would result in better browsing experience without js enabled.

[cndouglas]

This will likely be fixed with #428.

Setting webView.configuration.preferences.javascriptEnabled = false gives the following:

[iccub]

@jhreis did some initial tests with javascriptEnabled and said it didn't work this way.
We plan to work on this shortly after iOS 1.7 is released, thanks for doing the research Liunkae :)

[cndouglas]

Fixed by #428. Confirmed in the current master:

[iccub]

Fixed by #428