Fixes
+ Belts when broken will now release their items properly so they can be picked up again.
+ Belts now perform periodic validation checks. This means if removed via any method the belt will release its items. So world editing a belt, creeper explosion etc will now release its items properly.
+ All devices now do validation checks to make sure they are still placed their and not destroyed via other methods. This only occurs when players are nearby for performance reasons.
+ Autominers no longer mine blocks directly under belts.
+ Autominers no longer mine in an area, instead it works as intended scanning each layer 1 by 1.This means after it removes the top layer and moves on to the next you could fill in the top layer hiding the hole and the miner will ignore those blocks since its not in the current mining layer.
+ Fixed an onSecond error for when a belt became invalidated.