NegotiationControllerBuilder implemented, builds GenericIteratingAgentCreation agents;
GenericIteratingAgentCreation and a corresponding AgentBuilder added;
NegotiationController.GenericStaticAgentsInit added and works with GenericIteratingAgentCreation;
NegotiationController.StaticAgentsInit is left in code to salvage agent initiations;
removed `vars` from NegotiatingAgent.