Calculate environmental suitability

* Add a DiseaseOccurrenceValidationService to Common that adds "validation parameters" to a disease occurrence (i.e. environmental suitability, distance from disease extent, machine weighting, is validated)
* Add environmental suitability calculation to the new service
* Call the new service from Data Acquisition upon receiving new occurrences
* Call the new service from Model Output Handler upon receiving the initial model run outputs for a disease