Add a new subset of `AnyOwnedStructures`, excluding `KeeperLairs`, etc.

[DiamondMofeng]

Brief Description

In the source of @screeps/engine, we can see that StructurePowerBank,StructureKeeperLair,StructureInvaderCore are derived from OwnedStructure prototype. This was designed to support FIND_HOSTILE_STRUCTURES(especially PowerBank)

However, real players can never own those structures (in the official server).

We can add a new union of structures, excluding those unownable structures.

Considering that there is a Game.structures and typing it's value as AnyOwnedStructure is incorrect, it would be good to introduce this new union type.

[DocDvorak]

+1 to this. I've added something similar to my ambient declarations already.

/**
 * Utility type that extracts underlying {@link StructureConstant}s from
 * a discriminated {@link Structure} union
 */
type ExtractStructureType<T> = T extends Structure<infer U> ? U : never;

declare global {
  /**
   * A discriminated union of OwnedStructure types that can
   * only be owned by NPCs (invaders / source keepers / etc)
   */
  type AnyNpcStructure = AnyOwnedStructure & (
    StructureInvaderCore | StructureKeeperLair | StructurePowerBank);

  /** All {@link StructureConstant} types from {@link AnyNpcStructure} */
  type NpcStructureConstant = ExtractStructureType<AnyNpcStructure>;
}