Generic model simulator

The introduced changes should alleviate the legwork you need to do in java to make the simulation work. A newly introduced class based on the simulator can be used to simulate a single model. With some model annotation and specifying the generic of the new simulator class, most of the remaining legwork like creating metadata, parsing input and output data is done automatically. Since the new simulator is based on the old, it is still possible to override the old methods, but overriding the new ones introduced is recommended.