SafariServices iOS 14.5 to 15.0 API Differences

SFSafariApplication.h
Added SFExtensionMessageKey
SFSafariViewController.h
Added +[SFSafariViewController prewarmConnectionsToURLs:]
SFSafariViewControllerActivityButton.h
Added SFSafariViewControllerActivityButton
Added -[SFSafariViewControllerActivityButton initWithTemplateImage:extensionIdentifier:]
Added SFSafariViewControllerActivityButton.templateImage
Added SFSafariViewControllerActivityButton.extensionIdentifier
SFSafariViewControllerConfiguration.h
Added SFSafariViewControllerConfiguration.activityButton
SFSafariViewControllerPrewarmingToken.h
Added SFSafariViewControllerPrewarmingToken
Added -[SFSafariViewControllerPrewarmingToken invalidate]