Some performance improvements and fixes related to btVector3 being aligned on SPU.

btQuantizedBvh has a version number, memory layout might be different now (due to aligned btVector3)
reorganized some data members of some classes, to reduce memory footprint

src/BulletCollision/BroadphaseCollision/btQuantizedBvh.cpp

@@ -20,7 +20,9 @@ subject to the following restrictions:
 
 #define RAYAABB2
 
-btQuantizedBvh::btQuantizedBvh() : m_useQuantization(false), 
+btQuantizedBvh::btQuantizedBvh() : 
+					m_bulletVersion(BT_BULLET_VERSION),
+					m_useQuantization(false), 
 					//m_traversalMode(TRAVERSAL_STACKLESS_CACHE_FRIENDLY)
 					m_traversalMode(TRAVERSAL_STACKLESS)
 					//m_traversalMode(TRAVERSAL_RECURSIVE)
@@ -1136,10 +1138,10 @@ btQuantizedBvh *btQuantizedBvh::deSerializeInPlace(void *i_alignedDataBuffer, un
 btQuantizedBvh::btQuantizedBvh(btQuantizedBvh &self, bool /* ownsMemory */) :
 m_bvhAabbMin(self.m_bvhAabbMin),
 m_bvhAabbMax(self.m_bvhAabbMax),
-m_bvhQuantization(self.m_bvhQuantization)
+m_bvhQuantization(self.m_bvhQuantization),
+m_bulletVersion(BT_BULLET_VERSION)
 {
 
-
 }