Test all terminators

This should be easily testable. Goal is to have 100% test coverage in eva2.optimization.operator.terminators.

• CombinedTerminator
• DiversityTerminator
• EvaluationTerminator
• FitnessConvergenceTerminator
• FitnessValueTerminator
• GenerationTerminator
• HistoryConvergenceTerminator
• KnownOptimimaFoundTerminator
• MaximumTimeTerminator
• ParetoMetricTerminator
• PhenotypeConvergenceTerminator
• PopulationArchiveTerminator
• PopulationMeasureTerminator