Use branch feature/swift_wrapper_async_helpers of the linphone SDK

ios/swift/4-CallKitTutorial/CallKitTutorial/CallKitTutorial.swift

@@ -42,7 +42,7 @@ class CallKitExampleContext : ObservableObject
 	
 	func addRegistrationStateCallBack(core:Core) {
 		
-		core.accountStatePublisher
+		core.publisher?.onAccountRegistrationStateChanged?
 			.postOnMainQueue {  (publishedValue:(core: Core, account: Account, state: RegistrationState, message: String)) in
 				NSLog("New registration state is \(publishedValue.state) for user id \( String(describing: publishedValue.account.params?.identityAddress?.asString()))\n")
 				if (publishedValue.state == .Ok) {
@@ -61,7 +61,7 @@ class CallKitExampleContext : ObservableObject
 	
 	
 	func addCallStateChangedCallBack(core:Core) {
-		core.callStatePublisher
+		core.publisher?.onCallStateChanged?
 			.postOnMainQueue { (publishedValue:(core: Core, call: Call, state: Call.State, message: String)) in
 				self.callMsg = publishedValue.message
 				if (publishedValue.state == .PushIncomingReceived){