Adding a new detector

Adding a new process model

To add a new process model:

In datatypes.py: Add an appropriate entry eithin the Track.__init__, Track.predict, and Track.compute_proc_model definitions.
In output.py: Add
In tracker.py: Update supported_proc_models; add a ['obs_model']['proc_model'] entry for the process model; ensure declare_obj_params and set_obj_properties have entries for the necessary parameters;

For adding other features (new similarity metrics, two-stage association, non-max