WkWebView & SafariViewController instead of UIWebView

[rogerhu]

• The old UIWebView (http://guides.codepath.com/ios/Using-UIWebView) is a security nightmare and being deprecated. WkWebView has issues with exposing cookie info (http://bugs.webkit.org/show_bug.cgi?id=140191) but allows customization. Safari View Controller is good for launching an embedded Safari.

• https://developer.apple.com/videos/play/wwdc2015/504/

• https://www.hackingwithswift.com/read/32/3/how-to-use-sfsafariviewcontroller-to-browse-a-web-page

• https://www.macstories.net/stories/ios-9-and-safari-view-controller-the-future-of-web-views/