MacOS: Embedded window support.

platform/macos/godot_application.h

@@ -36,5 +36,15 @@
 #import <Foundation/Foundation.h>
 #import <IOKit/hidsystem/ev_keymap.h>
 
+@class GodotApplicationDelegate;
+
 @interface GodotApplication : NSApplication
+
+extern "C" GodotApplication *GodotApp;
+
+@property(readonly, nonatomic) GodotApplicationDelegate *godotDelegate;
+
+- (GodotApplication *)init;
+
+- (void)activateApplication;
 @end