Request: a beforeWorldStop method

[DudeSquaredEdud]

Hey Fox,

I'm trying to implement a method that corrects the player's position before the server closes (crouching changes the player's yOffset). Could you add a method that runs before everything else when the world stops / go back to title is pressed?

[Fox2Code]

@DudeSquaredEdud onNetworkPlayerDisconnected should work fine for it, and work on a per player basis instead of only once when entire server shutdown.

If you still think beforeWorldStop need to be added still, please send me a use case where it would be useful so I am sure to cover it.