Save
SpawnSystem
Cars disappear when they reach the destination
traffic lights
Lights
Lights on edges
Merge branch 'develop'

Conflicts:
	core/src/main/java/trafficsim/screens/SimulationScreen.java
Fixed some issues with the timer and merge problems
Merge branch 'origin/Feature-GraphIntegration'
Merge branch 'origin/develop'

Conflicts:
	core/src/main/java/trafficsim/screens/SimulationScreen.java
	core/src/main/java/trafficsim/screens/SuperScreen.java