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

Thanks to TomorrowPlus for the constribution!

Extras/AllBulletDemosOSX/src/toolkit/BTOpenGLDisplayDelegate.h

@@ -0,0 +1,50 @@
+/*
+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.
+*/
+
+#import <Cocoa/Cocoa.h>
+
+
+@protocol BTOpenGLDisplayDelegate
+
+- (void) contextCreated;
+- (void) contextWillBeDestroyed;
+- (void) contextWillResize;
+- (void) contextResized: (NSSize) newSize;
+- (void) contextDidResize;
+- (void) contextStateInvalidated;
+
+- (void) display: (float) deltaT;
+
+///////////////////////////////////////////////////////////////////////
+// ASCII keypresses
+
+- (void) keyPressed: (unsigned char) key;
+- (void) keyReleased: (unsigned char) key;
+
+///////////////////////////////////////////////////////////////////////
+// GLUT Special Keys, such as GLUT_KEY_LEFT ( "left arrow key" )
+
+- (void) specialKeyPressed: (unsigned) GLUTKey;
+- (void) specialKeyReleased: (unsigned) GLUTKey;
+
+///////////////////////////////////////////////////////////////////////
+// Mouse. button is GLUT_LEFT_MOUSE, GLUT_RIGHT_MOUSE, etc.
+
+- (void) mouseButtonPressed: (unsigned) mouseButton;
+- (void) mouseButtonReleased: (unsigned) mouseButton;
+- (void) mouseMoved: (NSPoint) delta;
+- (void) newMousePosition: (NSPoint) newMousePosition;
+- (void) scrollWheel: (NSPoint) delta;
+@end