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.
`ResolveOrder` was correct there, as that code is run from inside the synced Tick code.  Calling `IssueOrder` will make every game client issue that order over the network which will then (at best) generate anti-cheat warnings when they are dropped by the order validator.