Allow AIs to determine what class a resource has.

[Freagarach]

Currently, the resource AI classes are defined in the resource data, which is bad for moddability. E.g if one wants to have a AI that treats metal as a abundant resource, or define their own classes, that AI is not compatible with other AIs.

Two tasks here:

• Get the classes from the sim/data to the sim/ai.
• Get the values of making a resource map from the common-api to the AI themselve.

[Stan]

Refs ​https://code.wildfiregames.com/D3769

[Freagarach]

Pushing back.