Add Objects for Spiders and Cyberhounds

[midspace]

These may appear as "MyObjectBuilder_ReplicableEntity".
I haven't verified this as yet.

They need their own object structure, and the ability to have its inventory edited.
I'd hope we can have a generic NPC entity, and just label it as the appropriate creature type from the definition.
I believe they also have Inventory.

This may affect #14

[midspace]

As these are Characters, their inventory is already accessible.
No further work is required.