Implemented grouped traffic lights and tested.

Cars are no longer aware of traffic lights but I will fix this in the movement refactoring branch
Finish TrafficLightGrouping
Merged 'develop'.

Conflicts:
	core/src/main/java/trafficsim/factories/EntityFactory.java
	core/src/main/java/trafficsim/screens/SimulationScreen.java
Revert "Save"

This reverts commit 8dbfeca312b5dce8f440152eabb842d2e012ab10.
Revert "Save"

This reverts commit 8dbfeca312b5dce8f440152eabb842d2e012ab10. (reverted from commit b17d5dc173d7eb3fc0cf4a4777c7722025a5859f)

Fixed