added fracture scene .bullet file (doesn't work well yet)

added tetrahedral mesh test scene
expose b3Config as member variable for demos.
move a 'glFlush' out of the innerloop (render performance)
SSE -> SSE2 in premake
fix crash in broadphase (when no aabb's exist)

Demos3/GpuDemos/rigidbody/GpuRigidBodyDemoInternalData.h

@@ -4,6 +4,7 @@
 #include "Bullet3OpenCL/Initialize/b3OpenCLUtils.h"
 #include "Bullet3OpenCL/ParallelPrimitives/b3OpenCLArray.h"
 #include "Bullet3Common/b3Vector3.h"
+#include "Bullet3OpenCL/RigidBody/b3Config.h"
 
 struct	GpuRigidBodyDemoInternalData
 {
@@ -30,6 +31,7 @@ struct	GpuRigidBodyDemoInternalData
 	int m_pickFixedBody;
 	int m_pickGraphicsShapeIndex;
 	int m_pickGraphicsShapeInstance;
+	b3Config m_config;
 
 	GpuRigidBodyDemoInternalData()
 		:m_instancePosOrnColor(0),