Added AppKit framework & initial window hiding test

AppKitIntegration/AppKitController.swift

@@ -0,0 +1,45 @@
+//
+//  AppKitController.swift
+//  AppKitIntegration
+//
+//  Created by Steven Troughton-Smith on 30/01/2021.
+//
+
+import AppKit
+
+extension NSObject {
+    @objc func hostWindowForSceneIdentifier(_ identifier:String) -> NSWindow? {
+        return nil
+    }
+}
+
+class AppKitController : NSObject {
+    @objc public func _marzipan_setupWindow(_ note:Notification) {
+
+        NSLog("_marzipan_setupWindow: \(note.userInfo)")
+
+        guard let userInfo = note.userInfo, let sceneIdentifier = userInfo["SceneIdentifier"] as? String else { return }
+
+        hideWindowForSceneIdentifier(sceneIdentifier)
+    }
+
+    @objc public func hideWindowForSceneIdentifier(_ sceneIdentifier:String) {
+        guard let appDelegate = NSApp.delegate as? NSObject else { return }
+
+        if appDelegate.responds(to: #selector(hostWindowForSceneIdentifier(_:))) {
+            guard let hostWindow = appDelegate.hostWindowForSceneIdentifier(sceneIdentifier) else { return }
+
+            hostWindow.alphaValue = 0
+        }
+    }
+
+    @objc public func showWindowForSceneIdentifier(_ sceneIdentifier:String) {
+        guard let appDelegate = NSApp.delegate as? NSObject else { return }
+
+        if appDelegate.responds(to: #selector(hostWindowForSceneIdentifier(_:))) {
+            guard let hostWindow = appDelegate.hostWindowForSceneIdentifier(sceneIdentifier) else { return }
+
+            hostWindow.alphaValue = 1
+        }
+    }
+}

AppKitIntegration/AppKitIntegration.h

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+//
+//  AppKitIntegration.h
+//  AppKitIntegration
+//
+//  Created by Steven Troughton-Smith on 30/01/2021.
+//
+
+#import <Foundation/Foundation.h>
+
+//! Project version number for AppKitIntegration.
+FOUNDATION_EXPORT double AppKitIntegrationVersionNumber;
+
+//! Project version string for AppKitIntegration.
+FOUNDATION_EXPORT const unsigned char AppKitIntegrationVersionString[];
+
+// In this header, you should import all the public headers of your framework using statements like #import <AppKitIntegration/PublicHeader.h>
+
+

AppKitIntegration/Info.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>$(PRODUCT_BUNDLE_PACKAGE_TYPE)</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleVersion</key>
+	<string>$(CURRENT_PROJECT_VERSION)</string>
+</dict>
+</plist>