When mining drills run out of expected resources, they should mark themselves for deletion

[Darinth]

I believe 0.17 will be changing drones to operate in that fashion. If you're moving faster than drones, drones will not come out. I'd actually suggest setting the threshhold a bit lower potential, so that if you're moving say.... in excess of 80% of your drone speed they won't come out. Or maybe also factor in acceleration and max speed. That way you don't start accelerating while riding an automatic train, just to have a drone decide to go repair something and suddenly you're moving way faster than the drone would ever be able to catch you.