Fixes for broadphase/paircache determinism.

Revert definition for ATTRIBUTE_ALIGNED16, and try to force sizeof(btSolverConstraint) by using unions with btScalar, for non-btScalar data types.
Use btAssert and not assert.
Don't access btAlignedObjectArray elements, for zero sets

src/BulletCollision/CollisionShapes/btTriangleMeshShape.h

@@ -40,7 +40,7 @@ public:
 
 	virtual btVector3	localGetSupportingVertexWithoutMargin(const btVector3& vec)const
 	{
-		assert(0);
+		btAssert(0);
 		return localGetSupportingVertex(vec);
 	}