StoreKit: lots of new stuff
- new BillingInfo struct for subscriptions
- PricingTerms.SinglePrice, PricingTerms.SeatBasedPricing
- multiSeatDataSharingConsentEligibility
- and... showManageSubscriptions "Presents the App Store sheet for managing subscriptions" !
https://developer.apple.com/documentation/storekit/product/subscriptioninfo/billinginfo
UIKit: new UIBarContainerBehavior
"Whether this navigation controller acts as a bar container, reading the bar content of its child view controller and rendering that content in the navigation controller’s own bar."
https://developer.apple.com/documentation/uikit/uibarcontainerbehavior