Fixed objects which store Lua callback functions to avoid attempting to use dead coroutines when deleting the reference to the callback function. Should fix crashes when coroutines are mixed with those objects.

Also improved the performance of World:rayCast and World:queryBoundingBox.

src/modules/physics/box2d/wrap_World.cpp

@@ -39,6 +39,8 @@ int w_World_update(lua_State *L)
 {
 	World *t = luax_checkworld(L, 1);
 	float dt = (float)luaL_checknumber(L, 2);
+	// Make sure the world callbacks are using the calling Lua thread.
+	t->setCallbacksL(L);
 	luax_catchexcept(L, [&](){ t->update(dt); });
 	return 0;
 }