NEGroupCallKit 成员列表

成员的完整列表，这些成员属于 NEGroupCallKit,包括所有继承而来的类成员

-	addDelegate:	NEGroupCallKit
	callId	NEGroupCallKit
-	currentGroupRtcInfo	NEGroupCallKit
-	groupAccept:completion:	NEGroupCallKit
-	groupCall:completion:	NEGroupCallKit
-	groupHangup:completion:	NEGroupCallKit
-	groupInvite:completion:	NEGroupCallKit
-	groupJoin:completion:	NEGroupCallKit
-	groupQueryCallInfo:completion:	NEGroupCallKit
-	groupQueryMembers:completion:	NEGroupCallKit
-	removeDelegate:	NEGroupCallKit
-	setupGroupCall:	NEGroupCallKit
+	sharedInstance	NEGroupCallKit	static