11886 remove extra redundant channels setup in iOS embedding engine

12078 Manage iOS contexts separately

12084 Guard availability of user notification related methods to iOS 10.0

12192 Updating text field location in IOS as a pre-work for spellcheck

12295 Issue 13238: on iOS, force an orientation change when the current orientation is not allowed

12404 Support accessibility labels on iOS switches.

12990 Fix for a11y crash on iOS

13029 Minimal test harness for iOS

13051 Don’t bump iOS deployment target for Metal builds.

13093 iOS Platform View: Fixed overrelease of the observer.