Run should operate on generic models

[dhixsingh]

At the moment the Run class holds explicitly named instances of different models. This should be standardised into list of Models on which the init/step/finish should be called.

As part of this we also want to allow users applications to swap out default models with their own. This has become apparent in the social network diffusion work.

[dhixsingh]

There is now an interim mechanism to override models using the withModel function. Example usage is below:

ees/src/main/java/io/github/agentsoz/ees/Run.java

Lines 80 to 83 in a82f094

	new Run()
	.withModel(DataServer.getInstance(DATASERVER))
	.withModel(new DiffusionModel(cfg.getModelConfig(Config.eModelDiffusion), DataServer.getInstance(DATASERVER), new ArrayList<>(bdiMap.keySet())))
	.start(cfg, bdiMap);

/cc @chambul