Change configurable factory to registry

src/aliensimulator/AlienSimulator.java

src/aliensimulator/predators/HishQuTen.java

src/aliensimulator/predators/Predator.java

src/aliensimulator/predators/PredatorFactory.java

src/aliensimulator/predators/PredatorRegistry.java

src/aliensimulator/predators/Yautja.java

src/aliensimulator/predators/predator.properties