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

Thanks to TomorrowPlus for the constribution!

Extras/AllBulletDemosOSX/src/BTDemosAppController.h

@@ -0,0 +1,54 @@
+/*
+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>
+#import "BTOpenGLView.h"
+#import "BTSimulationParameters.h"
+#import "BTDemo.h"
+
+@interface BTDemosAppController : NSObject {
+
+	IBOutlet BTOpenGLView* _glView;
+	IBOutlet BTSimulationParameters *_parameters;
+
+	BTDemo *_currentDemo;
+	BOOL _showParameters;
+}
+
+///////////////////////////////////////////////////////////////////////
+// Public API
+
+- (void) setFullscreen: (BOOL) fullscreen;
+- (BOOL) fullscreen;
+
+- (void) setShowParameters: (BOOL) showParameters;
+- (BOOL) showParameters;
+
+- (NSArray*) demos;
+
+- (void) setDemo: (NSString*) demoName;
+- (NSString*) demo;
+
+///////////////////////////////////////////////////////////////////////
+// IBActions
+
+- (IBAction) nextDemo: (id) sender;
+- (IBAction) previousDemo: (id) sender;
+- (IBAction) toggleFullscreen: (id) sender;
+- (IBAction) toggleParameters: (id) sender;
+- (IBAction) resetDemo: (id) sender;
+- (IBAction) nullMenuTarget: (id) sender;
+
+@end