* Pool map views on iOS 10 to avoid memory issues
Clean up disposal implementation for map renderer, delegate
* Enable 39489 test on iOS
* Add missing XF Maps references
* Add missing maps reference to Windows 8.1 project
* Actually enable the test for iOS
* Fix placement of Isolate override
* Don't create a new control for ImageRenderer if NewElement is null
* Reverting fixes to ViewRenderer Dispose; have to fix that in a separate PR