Add the old Bullet 2.x obsolete demos, and CMake buildsystem files, and gradually move them to newer Bullet 3.x structure

Use statically linked freeglut, instead of dynamic glut for the obsolete Bullet 2.x demos
Add the 'reset' method to b3GpuDynamicsWorld, and use it in the BasicGpuDemo (pretty slow in debug mode, use release mode)
Don't crash in btCollisionWorld, if there is no collision dispatcher

ObsoleteDemos/CMakeLists.txt

@@ -0,0 +1,66 @@
+
+SUBDIRS( HelloWorld )
+
+
+IF (USE_GLUT)
+	IF (GLUT_FOUND)
+		IF(BUILD_CPU_DEMOS)
+#			IF(BUILD_EXTRAS)
+#				SUBDIRS( BulletXmlImportDemo ConcaveDemo ConstraintDemo ConvexDecompositionDemo SerializeDemo )
+#			ENDIF()
+			SET(SharedDemoSubdirs
+				OpenGL   
+				CcdPhysicsDemo   SliderConstraintDemo GenericJointDemo Raytracer
+				RagdollDemo ForkLiftDemo BasicDemo FeatherstoneMultiBodyDemo RollingFrictionDemo RaytestDemo VoronoiFractureDemo 
+				GyroscopicDemo FractureDemo Box2dDemo BspDemo MovingConcaveDemo VehicleDemo
+				UserCollisionAlgorithm CharacterDemo SoftDemo 
+				CollisionInterfaceDemo ConcaveConvexcastDemo SimplexDemo DynamicControlDemo
+				ConvexHullDistance 
+				DoublePrecisionDemo  CollisionDemo
+				ContinuousConvexCollision ConcaveRaycastDemo GjkConvexCastDemo
+				MultiMaterialDemo InternalEdgeDemo 
+			)
+		ELSE()
+			SET(SharedDemoSubdirs			OpenGL		)
+		ENDIF(BUILD_CPU_DEMOS)
+		
+		IF(BUILD_MULTITHREADING)
+			SUBDIRS(	MultiThreadedDemo			OpenCLClothDemo			)
+		ENDIF(BUILD_MULTITHREADING)
+
+		SUBDIRS( 		
+			${SharedDemoSubdirs}
+			Benchmarks
+		)
+		
+		IF(BUILD_MULTITHREADING)
+			SUBDIRS(	ThreadingDemo		VectorAdd_OpenCL )
+		ENDIF()
+
+	ENDIF(GLUT_FOUND)
+ELSE (USE_GLUT)
+	IF (WIN32)
+		SUBDIRS( 
+		OpenGL 
+		BasicDemo
+		RaytestDemo
+		FractureDemo
+		Benchmarks 
+		Box2dDemo 
+		CollisionInterfaceDemo 
+		ConcaveDemo 
+		ConstraintDemo
+		RollingFrictionDemo
+		ConvexDecompositionDemo 
+		InternalEdgeDemo
+		GyroscopicDemo
+		FeatherstoneMultiBodyDemo
+		GenericJointDemo 
+		SerializeDemo 
+		SoftDemo
+		VectorAdd_OpenCL
+		VoronoiFractureDemo
+	)
+	ENDIF(WIN32)
+ENDIF (USE_GLUT)
+