Add support for iOS and macOS via MoltenVK.

xcode/macos/DemoViewController.h

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+/*
+ * DemoViewController.h
+ *
+ * Copyright (c) 2014-2017 The Brenwill Workshop Ltd. All rights reserved.
+ * http://www.brenwill.com
+ *
+ * Use of this document is governed by the Molten License Agreement, as included
+ * in the Molten distribution package. CAREFULLY READ THAT LICENSE AGREEMENT BEFORE
+ * READING AND USING THIS DOCUMENT. BY READING OR OTHERWISE USING THIS DOCUMENT,
+ * YOU ACCEPT AND AGREE TO BE BOUND BY THE TERMS AND CONDITIONS OF THAT LICENSE
+ * AGREEMENT. IF YOU DO NOT ACCEPT THE TERMS AND CONDITIONS OF THAT LICENSE AGREEMENT,
+ * DO NOT READ OR USE THIS DOCUMENT.
+ */
+
+#import <AppKit/AppKit.h>
+
+
+#pragma mark -
+#pragma mark DemoViewController
+
+/** The main view controller for the demo storyboard. */
+@interface DemoViewController : NSViewController
+@end
+
+
+#pragma mark -
+#pragma mark DemoView
+
+/** The Metal-compatibile view for the demo Storyboard. */
+@interface DemoView : NSView
+@end
+