[coretelephony] Add deprecations, in favour of CallKit, for iOS 10 beta 1 (#279)

src/CoreTelephony/CoreTelephony.cs

@@ -6,24 +6,28 @@ namespace XamCore.CoreTelephony {
 
 	public partial class CTCall {
 #if !COREBUILD
+		[Availability (Deprecated = Platform.iOS_10_0, Message = "Use CallKit")]
 		public string StateDialing {
 			get {
 				return Dlfcn.SlowGetStringConstant (Constants.CoreTelephonyLibrary, "CTCallStateDialing");
 			}
 		}
-		
+
+		[Availability (Deprecated = Platform.iOS_10_0, Message = "Use CallKit")]
 		public string StateIncoming {
 			get {
 				return Dlfcn.SlowGetStringConstant (Constants.CoreTelephonyLibrary, "CTCallStateIncoming");
 			}
 		}
-		
+
+		[Availability (Deprecated = Platform.iOS_10_0, Message = "Use CallKit")]
 		public string StateConnected {
 			get {
 				return Dlfcn.SlowGetStringConstant (Constants.CoreTelephonyLibrary, "CTCallStateConnected");
 			}
 		}
-		
+
+		[Availability (Deprecated = Platform.iOS_10_0, Message = "Use CallKit")]
 		public string StateDisconnected {
 			get {
 				return Dlfcn.SlowGetStringConstant (Constants.CoreTelephonyLibrary, "CTCallStateDisconnected");

src/coretelephony.cs

@@ -6,9 +6,11 @@ namespace XamCore.CoreTelephony {
 	[Since (4,0)]
 	[BaseType (typeof (NSObject))]
 	interface CTCall {
+		[Availability (Deprecated = Platform.iOS_10_0, Message = "Use CallKit")]
 		[Export ("callID")]
 		string CallID { get;  }
 
+		[Availability (Deprecated = Platform.iOS_10_0, Message = "Use CallKit")]
 		[Export ("callState")]
 		string CallState { get; }
 
@@ -91,6 +93,7 @@ namespace XamCore.CoreTelephony {
 	[BaseType (typeof (NSObject))]
 	[Since (4,0)]
 	interface CTCallCenter {
+		[Availability (Deprecated = Platform.iOS_10_0, Message = "Use CallKit")]
 		[NullAllowed] // by default this property is null
 		[Export ("callEventHandler")]
 #if XAMCORE_2_0
@@ -99,6 +102,7 @@ namespace XamCore.CoreTelephony {
 		CTCallEventHandler CallEventHandler { get; set; }
 #endif
 
+		[Availability (Deprecated = Platform.iOS_10_0, Message = "Use CallKit")]
 		[Export ("currentCalls")]
 		NSSet CurrentCalls { get; }