Added Mac OSX XCode project with Cocoa userinterface (wrapping GLUT) for Bullet demos

Thanks to TomorrowPlus for the constribution!

Extras/AllBulletDemosOSX/src/toolkit/BTGLUTKeyAdapter.h

@@ -0,0 +1,46 @@
+/*
+Bullet Continuous Collision Detection and Physics Library
+Copyright (c) 2003-2006 Erwin Coumans  http://continuousphysics.com/Bullet/
+
+This software is provided 'as-is', without any express or implied warranty.
+In no event will the authors be held liable for any damages arising from the use of this software.
+Permission is granted to anyone to use this software for any purpose, 
+including commercial applications, and to alter it and redistribute it freely, 
+subject to the following restrictions:
+
+1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
+2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
+3. This notice may not be removed or altered from any source distribution.
+*/
+
+#ifndef __BT_KEY_CODE_H__
+#define __BT_KEY_CODE_H__
+
+#include <GLUT/glut.h>
+
+#if defined(__cplusplus)
+extern "C" {
+#endif
+
+/**
+	@brief Determine if a key is a letter.
+	@return true if @a keycode is a letter, and not a control
+	or modifier key. E.g., the letter 'b' is, where the Esc key ( BTKey_Escape ) is not.
+*/
+extern BOOL BTKeyIsAlpha( int );
+
+/**
+	@brief Determine if a key is a GLUT special key. ( arrow, F-Keys, etc )
+*/
+extern BOOL BTKeyIsSpecial( int keycode );
+
+/**
+	@brief Convert an OS X keycode to GLUT Special key representation
+*/
+extern int BTKeyTranslateKeyCodeToSpecial( int );
+
+#if defined(__cplusplus)
+}
+#endif
+
+#endif