More stubs

Just spend the last hour or so writing up more stub functions in AI and Fighter, as well as setting up some more specialised datatypes. Building from the ground up here, or "top-down", I guess. I created a base abstract Controller class which the three fighter controller types (Human, AI, COM) inherit from in order to store some controller-common information such as which player (one or two) the controller is controlling. This sort of information needs to be made available to the decision-making processes of AI/COM to determine who is who in the world state information.