World mode simulation

Multi-agent simulation. Each agent represents a nation.

World map is a graph which defines which nations neighbor each other.

Each agent is a convex combination over the following mentalities:

1. Builder - builds technology to further each other priority in proportion to that priority

2. Hoarder - hoards items in proportion to other priorities

3. Trader - trades to achieve other priorities, margin parameter - specifies target proportion of unwanted items to hold in reserve (compared to global supply of those items)

Parameters:

1. Aggression: Determines how much stronger the nation should be than its weakest neighbor before it considers attacking it.

2. Efficiency: Percentage of max resources are harvested by harvesting population on every turn.

3. Defensiveness: At what percentage of attack strength a neighbor should be before this nation starts hoarding exclusively.