Screeps 4.x store changes

[shanemadden]

Screeps 4.0 deprecates Creep.carry and the non-.store storage attributes on a number of structures. CanStoreEnergy should be removed and all of these structures (and possibly also creeps?) should be added to HasStore (removing ghodium()/ghodium_capacity() from nukers, mineral_amount() from labs etc) to move off of the deprecated properties.

[daboross]

Sounds good!

I think we'll also want some methods to match Store.getCapacity(Resource) and getFreeCapacity / getUsedCapacity, since those are new and replace the specific methods like ghodium_capacity.

Another design question, though: what do we want to do with the Store type? We could:

• just stick all the binding methods on HasStore, and ignore the existence of Store
• add a Store type, and replace HasStore with:

  trait HasStore {
    fn store(&self) -> Store { ... }
  }

• add a Store type & keep existing HasStore methods as well, for convenience

I'm inclined towards the last option, but any of these or any others could be good?

[ASalvail]

They added a prototype in order to make a unified interface. It feels a lot like a trait already, so my vote goes to sticking everything in HasStore.