Fix/improve raycast performance for btBvhTriangleMeshShape (btQuantizedBvh, btOptimizedBvh)

Add raycast acceleration for btAxisSweep3, using btDbvtBroadphase, providing large speedup. Can be disabled in constructor to safe memory.

src/BulletCollision/BroadphaseCollision/btBroadphaseInterface.h

@@ -25,6 +25,7 @@ class btOverlappingPairCache;
 
 struct	btBroadphaseRayCallback
 {
+	virtual ~btBroadphaseRayCallback() {}
 	virtual bool	process(const btBroadphaseProxy* proxy) = 0;
 };