D2k: Sandworms implementation

Using Mailaender's code as basis, this is my implementation of the sandworm behavior. It is still WIP, but you can get an idea of how it looks from the shellmap.
Replaced AttackWander with this. I noticed that AttackWander uses
self.Trait<AttackMove>().ResolveOrder(...)
Replaced it with 
self.World.IssueOrder(...)