1)Added SCE Physics Effects boxBoxDistance

BulletMultiThreaded/NarrowPhaseCollision makes use of this boxBoxDistance.
Cache some values in src/BulletMultiThreaded/SpuContactManifoldCollisionAlgorithm.cpp, to avoid DMA transfers

2) Added btConvexSeparatingDistanceUtil: this allows caching of separating distance/vector as early-out to avoid convex-convex collision detection.
btConvexSeparatingDistanceUtil is used in src/BulletCollision/CollisionDispatch/btConvexConvexAlgorithm.cpp and can be controlled by btDispatcherInfo.m_useConvexConservativeDistanceUtil/m_convexConservativeDistanceThreshold

3) Use BulletMultiThreaded/vectormath/scalar/cpp/vectormath/scalar/cpp/vectormath_aos.h as fallback for non-PlayStation 3 Cell SPU/PPU platforms (used by boxBoxDistance).
Note there are other implementations in Extras/vectormath folder, that are potentially faster for IBM Cell SDK 3.0 SPU (libspe2)

src/BulletMultiThreaded/SpuContactManifoldCollisionAlgorithm.h

@@ -26,13 +26,18 @@ class btPersistentManifold;
 /// SpuContactManifoldCollisionAlgorithm  provides contact manifold and should be processed on SPU.
 ATTRIBUTE_ALIGNED16(class) SpuContactManifoldCollisionAlgorithm : public btCollisionAlgorithm
 {
-
+	btVector3	m_shapeDimensions0;
+	btVector3	m_shapeDimensions1;
 	btPersistentManifold*	m_manifoldPtr;
 	int		m_shapeType0;
 	int		m_shapeType1;
 	float	m_collisionMargin0;
 	float	m_collisionMargin1;
 
+	btCollisionObject*	m_collisionObject0;
+	btCollisionObject*	m_collisionObject1;
+	
+
 	
 public:
 	
@@ -57,6 +62,16 @@ public:
 		return m_manifoldPtr;
 	}
 
+	btCollisionObject*	getCollisionObject0()
+	{
+		return m_collisionObject0;
+	}
+	
+	btCollisionObject*	getCollisionObject1()
+	{
+		return m_collisionObject1;
+	}
+
 	int		getShapeType0() const
 	{
 		return m_shapeType0;
@@ -75,6 +90,16 @@ public:
 		return m_collisionMargin1;
 	}
 
+	const btVector3&	getShapeDimensions0() const
+	{
+		return m_shapeDimensions0;
+	}
+
+	const btVector3&	getShapeDimensions1() const
+	{
+		return m_shapeDimensions1;
+	}
+
 	struct CreateFunc :public 	btCollisionAlgorithmCreateFunc
 	{
 		virtual	btCollisionAlgorithm* CreateCollisionAlgorithm(btCollisionAlgorithmConstructionInfo& ci, btCollisionObject* body0,btCollisionObject* body1)