[ModelIO] Implement Xcode 16.0 beta 1-6 changes. (#21032)

Note: there were no changes in beta 2, beta 3, beta 4, beta 5 or beta 6.

Author: rolfbjarne

src/modelio.cs

@@ -3249,4 +3249,12 @@ interface MDLAnimatedQuaternion {
 		nuint _GetDoubleQuaternionArray (IntPtr valuesArray, nuint maxCount);
 	}
 
+	[TV (18, 0), Mac (15, 0), iOS (18, 0), MacCatalyst (18, 0)]
+	[DisableDefaultCtor]
+	[BaseType (typeof (NSObject))]
+	interface MDLUtility {
+		[Static]
+		[Export ("convertToUSDZ:writeToURL:")]
+		void ConvertToUsdz (NSUrl inputUrl, NSUrl outputUrl);
+	}
 }

tests/cecil-tests/Documentation.KnownFailures.txt

@@ -42865,6 +42865,7 @@ M:ModelIO.MDLTransformTranslateOp.GetNMatrix4(System.Double)
 M:ModelIO.MDLTransformTranslateOp.GetNMatrix4d(System.Double)
 M:ModelIO.MDLUrlTexture.#ctor(Foundation.NSData,System.Boolean,System.String,CoreGraphics.NVector2i,System.IntPtr,System.UIntPtr,ModelIO.MDLTextureChannelEncoding,System.Boolean)
 M:ModelIO.MDLUrlTexture.#ctor(Foundation.NSUrl,System.String)
+M:ModelIO.MDLUtility.ConvertToUsdz(Foundation.NSUrl,Foundation.NSUrl)
 M:ModelIO.MDLVertexAttribute.#ctor(System.String,ModelIO.MDLVertexFormat,System.UIntPtr,System.UIntPtr)
 M:ModelIO.MDLVertexAttribute.Copy(Foundation.NSZone)
 M:ModelIO.MDLVertexBufferLayout.#ctor(System.UIntPtr)
@@ -82984,6 +82985,7 @@ T:ModelIO.MDLTransformRotateZOp
 T:ModelIO.MDLTransformScaleOp
 T:ModelIO.MDLTransformStack
 T:ModelIO.MDLTransformTranslateOp
+T:ModelIO.MDLUtility
 T:ModelIO.MDLVertexFormatExtensions
 T:ModelIO.MDLVoxelIndexExtent
 T:NaturalLanguage.NLContextualEmbedding