Added a feature to drag entities around on earth! A few notes on this:
* Entities cannot be dragged up blocks (at least until I bother to find a nice way to do this)
* The speed at which entities are dragged is the pullspeed in the config divided by 1.5 (for all you diehard config balancers)
* It only works on earthbendable blocks!
* This feature takes priority over the other feature, and is activated by looking at an entity when starting to use the ability. If you want to drag items towards you, don't be looking at an entity when you start it.
