Add support for interstitial user confirmation of self-signed SSL certs to CordovaWebView and InAppBrowser

Local https links are blocked by default in InAppBrowser (links using a local SSL certificate which can't be verified by a 3rd party). Ideally, user should be given an option to proceed or cancel the request like the default desktop/mobile browsers do.

Right now, we have to overwrite the following API in Android to access such URLs but onReceivedSslError() function gets called only for the main PhoneGap window browser and not for InAppBrowser.

Create a new class:
public class CustomWebViewClient extends CordovaWebViewClient {

public static final String LOG_TAG = "Plugin";

public CustomWebViewClient(DroidGap ctx)

@Override
public void onReceivedSslError(WebView view, SslErrorHandler handler, SslError error)

}

In the main class, we use our custom class as a web view client
CordovaWebViewClient webViewClient = new CustomWebViewClient(this);
webViewClient.setWebView(this.appView);
this.appView.setWebViewClient(webViewClient);

And similar type of code needs to be written for iOS.

InAppBrowser should pick up the SSL settings from the main web view and once we overwrite the onReceivedSslError() function, then it should allow such URLs in the InAppBrowser too.