Adds ability to display UIImage above the title label of UIAlertController.
Functionality is achieved by adding “\n” characters to title, to make space
for UIImageView to be added to UIAlertController.view. Set title as
normal but when retrieving value use originalTitle property.
Adds ability to display image left of the action title, by leveraging KVC.
Also checks whether UIAlertAction responds to appropriate selector to
avoid crashes if property is not available in the future.
