[src] Add AppKit to Mac Catalyst. (#12268)

* A lot of availability attribute updates.
* Some conditional "#if !__MACCATALYST__" in manual binding files.
* xtro updates.
* Misc other minor tweaks.

src/AppKit/ActionDispatcher.cs

@@ -32,15 +32,20 @@
 namespace AppKit
 {
 	[Register ("__monomac_internal_ActionDispatcher")]
-	internal class ActionDispatcher : NSObject, INSMenuValidation // INSMenuValidation needed for using the Activated method of NSMenuItems if you want to be able to validate
+	internal class ActionDispatcher : NSObject
+#if !__MACCATALYST__
+		, INSMenuValidation // INSMenuValidation needed for using the Activated method of NSMenuItems if you want to be able to validate
+#endif
 	{
 		const string skey = "__monomac_internal_ActionDispatcher_activated:";
 		const string dkey = "__monomac_internal_ActionDispatcher_doubleActivated:";
 		public static Selector Action = new Selector (skey);
 		public static Selector DoubleAction = new Selector (dkey);
 		public EventHandler Activated;
 		public EventHandler DoubleActivated;
+#if !__MACCATALYST__
 		public Func<NSMenuItem, bool> ValidateMenuItemFunc;
+#endif // !__MACCATALYST__
 
 		[Preserve, Export (skey)]
 		public void OnActivated (NSObject sender)
@@ -105,13 +110,15 @@ public static void RemoveDoubleAction (NSObject target, EventHandler doubleHandl
 			ctarget.DoubleActivated -= doubleHandler;
 		}
 
+#if !__MACCATALYST__
 		public bool ValidateMenuItem (NSMenuItem menuItem)
 		{
 			if (ValidateMenuItemFunc != null)
 				return ValidateMenuItemFunc (menuItem);
 
 			return true;
 		}
+#endif // !__MACCATALYST__
 
 		[Preserve]
 		public bool WorksWhenModal {

src/AppKit/BeginSheet.cs

@@ -23,6 +23,9 @@
 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 //
+
+#if !__MACCATALYST__ // Mac Catalyst doesn't have NSApplication
+
 using System;
 using System.Collections;
 
@@ -69,3 +72,4 @@ public void BeginSheet (NSPrintInfo printInfo, NSWindow docWindow, Action onEnde
 		}
 	}
 }
+#endif // !__MACCATALYST__

src/AppKit/Compat.cs

@@ -1,3 +1,4 @@
+#if !__MACCATALYST__
 using System;
 using System.ComponentModel;
 
@@ -50,3 +51,4 @@ public static class NSFileTypeForHFSTypeCode
 	}
 #endif
 }
+#endif // !__MACCATALYST__

src/AppKit/DoubleWrapper.cs

@@ -22,6 +22,9 @@
 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 //
+
+#if !__MACCATALYST__
+
 using System;
 using Foundation;
 
@@ -98,4 +101,5 @@ public event EventHandler DoubleClick {
 			}
 		}
 	}
-}
+}
+#endif // !__MACCATALYST__