Resource Mechanics

Resources other than plants exist. The entites can do things with the resources. Entities take the resources home. Entities require resources to be spawned.
This issue will not add other resources, but follow on work that adds new resources will depend on this one. The only resource we will add is plant matter.

Requirements

Agents can carry objects
The faction requires resources to create new agents
agents require resources to be created.
Factions have a resource counter interface

Blocked by

trail entities
- resource mechanics will require agents lives to
  be dictated by somthing other than a max trail length if they can only be created with resources being added
reverse navigation home
- Agents have to be able to make it home in order to find and return resources.