[SpriteKit] Fix all availability attributes in this framework. (#22674)

* Add/adjust availability attributes.
* Remove !.NET availability attributes / code.

This is a step towards fixing #21185.

Author: rolfbjarne

runtime/bindings-generator.cs

@@ -1151,6 +1151,19 @@ static IEnumerable<FunctionData> GetFunctionData ()
 				}
 			);
 
+			data.Add (
+				new FunctionData {
+					Comment = " // NativeHandle func (NativeHandleType, Vector2)",
+					Prefix = "simd__",
+					Variants = Variants.msgSend | Variants.msgSendSuper,
+					ReturnType = Types.NativeHandle,
+					Parameters = new ParameterData [] {
+						new ParameterData { TypeData = Types.NativeHandle },
+						new ParameterData { TypeData = Types.Vector2 },
+					},
+				}
+			);
+
 			data.Add (
 				new FunctionData {
 					Comment = " // IntPtr func (IntPtr, Vector2, Vector2); @try",

src/SpriteKit/SKAction.cs

@@ -14,12 +14,6 @@
 #nullable enable
 
 namespace SpriteKit {
-
-#if !NET
-	[Obsolete ("Use 'SKActionTimingFunction2' instead.")]
-	public delegate void SKActionTimingFunction (float /* float, not CGFloat */ time);
-#endif
-
 	public partial class SKAction {
 
 		/// <param name="size">To be added.</param>
@@ -31,10 +25,5 @@ public static SKAction ResizeTo (CGSize size, double duration)
 		{
 			return SKAction.ResizeTo (size.Width, size.Height, duration);
 		}
-
-#if !NET
-		[Obsolete ("Use 'TimingFunction2' instead.")]
-		public virtual SKActionTimingFunction? TimingFunction { get; set; }
-#endif
 	}
 }

src/SpriteKit/SKNode.cs

@@ -19,7 +19,6 @@
 
 namespace SpriteKit {
 	public partial class SKNode : IEnumerable, IEnumerable<SKNode> {
-#if NET
 		/// <typeparam name="T">To be added.</typeparam>
 		///         <param name="file">
 		///
@@ -33,7 +32,6 @@ public partial class SKNode : IEnumerable, IEnumerable<SKNode> {
 		[SupportedOSPlatform ("macos")]
 		[SupportedOSPlatform ("maccatalyst")]
 		[SupportedOSPlatform ("tvos")]
-#endif
 		public static T? FromFile<T> (string file) where T : SKNode
 		{
 			var fileHandle = CFString.CreateNative (file);
@@ -81,7 +79,6 @@ IEnumerator IEnumerable.GetEnumerator ()
 			return GetEnumerator ();
 		}
 
-#if NET
 		/// <param name="filename">To be added.</param>
 		///         <param name="types">To be added.</param>
 		///         <param name="error">To be added.</param>
@@ -92,7 +89,6 @@ IEnumerator IEnumerable.GetEnumerator ()
 		[SupportedOSPlatform ("macos")]
 		[SupportedOSPlatform ("ios")]
 		[SupportedOSPlatform ("maccatalyst")]
-#endif
 		public static SKNode? Create (string filename, Type [] types, out NSError error)
 		{
 			// Let's fail early.
@@ -112,7 +108,6 @@ IEnumerator IEnumerable.GetEnumerator ()
 			}
 		}
 
-#if NET
 		/// <param name="filename">To be added.</param>
 		///         <param name="classes">To be added.</param>
 		///         <param name="error">To be added.</param>
@@ -123,7 +118,6 @@ IEnumerator IEnumerable.GetEnumerator ()
 		[SupportedOSPlatform ("macos")]
 		[SupportedOSPlatform ("ios")]
 		[SupportedOSPlatform ("maccatalyst")]
-#endif
 		public static SKNode? Create (string filename, NSSet<Class> classes, out NSError error)
 		{
 			// `filename` will be checked by `Create` later

src/SpriteKit/SKShapeNode.cs

@@ -15,8 +15,6 @@
 
 namespace SpriteKit {
 	public partial class SKShapeNode : SKNode {
-
-#if NET
 		/// <param name="points">To be added.</param>
 		///         <summary>Creates a new shape node from the specified <paramref name="points" />.</summary>
 		///         <returns>To be added.</returns>
@@ -25,7 +23,6 @@ public partial class SKShapeNode : SKNode {
 		[SupportedOSPlatform ("macos")]
 		[SupportedOSPlatform ("maccatalyst")]
 		[SupportedOSPlatform ("tvos")]
-#endif
 		public static SKShapeNode FromPoints (CGPoint [] points)
 		{
 			if (points is null)
@@ -34,7 +31,6 @@ public static SKShapeNode FromPoints (CGPoint [] points)
 			return FromPoints (ref points [0], (nuint) points.Length);
 		}
 
-#if NET
 		/// <param name="points">To be added.</param>
 		///         <param name="offset">To be added.</param>
 		///         <param name="length">To be added.</param>
@@ -45,7 +41,6 @@ public static SKShapeNode FromPoints (CGPoint [] points)
 		[SupportedOSPlatform ("macos")]
 		[SupportedOSPlatform ("maccatalyst")]
 		[SupportedOSPlatform ("tvos")]
-#endif
 		public static SKShapeNode FromPoints (CGPoint [] points, int offset, int length)
 		{
 			if (points is null)
@@ -56,7 +51,6 @@ public static SKShapeNode FromPoints (CGPoint [] points, int offset, int length)
 			return FromPoints (ref points [offset], (nuint) length);
 		}
 
-#if NET
 		/// <param name="points">To be added.</param>
 		///         <summary>Creates a new shape node from the specified spline <paramref name="points" />.</summary>
 		///         <returns>To be added.</returns>
@@ -65,7 +59,6 @@ public static SKShapeNode FromPoints (CGPoint [] points, int offset, int length)
 		[SupportedOSPlatform ("macos")]
 		[SupportedOSPlatform ("maccatalyst")]
 		[SupportedOSPlatform ("tvos")]
-#endif
 		public static SKShapeNode FromSplinePoints (CGPoint [] points)
 		{
 			if (points is null)
@@ -74,7 +67,6 @@ public static SKShapeNode FromSplinePoints (CGPoint [] points)
 			return FromSplinePoints (ref points [0], (nuint) points.Length);
 		}
 
-#if NET
 		/// <param name="points">To be added.</param>
 		///         <param name="offset">To be added.</param>
 		///         <param name="length">To be added.</param>
@@ -85,7 +77,6 @@ public static SKShapeNode FromSplinePoints (CGPoint [] points)
 		[SupportedOSPlatform ("macos")]
 		[SupportedOSPlatform ("maccatalyst")]
 		[SupportedOSPlatform ("tvos")]
-#endif
 		public static SKShapeNode FromSplinePoints (CGPoint [] points, int offset, int length)
 		{
 			if (points is null)