Objj2 compiler fixes

Compiled all files individually:

- Added missing imports.
- Added @class/@global declarations to break circular dependencies.
- Misc. code cleanup.

Conflicts:
	AppKit/CPWindow/_CPWindow.j
	AppKit/Platform/DOM/CPPlatformWindow+DOM.j

AppKit/CPMenu/_CPMenuManager.j

@@ -1,7 +1,32 @@
-@import <Foundation/Foundation.j>
-@import "CPWindow.j"
-@import "CPEvent.j"
+/*
+ * _CPMenuManager.j
+ * AppKit
+ *
+ * Created by Francisco Tolmasky.
+ * Copyright 2009, 280 North, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
 
+@import <Foundation/CPObject.j>
+@import <Foundation/CPNotificationCenter.j>
+
+@import "CPEvent.j"
+@import "CPKeyBinding.j"
+
+@class CPWindow
 @class _CPMenuWindow