Efficient mgfcall_map updates for variables not pulled from the queue

[georgematheos]

I am currently working on a way for efficient updates to mgfcall_maps which are in world variables which are being updated after being pulled off the update queue, but not ones which are updated via a recursive call. In some situations involving recursive calls, we may be able to produce more efficient updates, but it would probably require tracking the topological indices of variables looked up in the map. This would introduce a decent amount of complexity, and some performance detriments in many cases. It may be worth thinking through what the performance tradeoffs this would introduce are, and whether it is worth trying to implement some version of this.