Add Tram illustration
Merge branch 'dev'
Merge branch 'dev'
Merge branch 'temp' into background
Massive commit, did not committed in between :(
Merge branch 'dev' into background
can choose the scene in the start
Merge branch 'dev' into background
Now the prefab works
Merge branch 'dev' into background
Merge branch 'dev' into background
The begin Screen
Merge branch 'dev' into background

Conflicts:
	Dummy/Assets/Scene.unity
	Dummy/Assets/SceneB.unity
difficulty level scroll bar
try to share the data between scene. But fail...
Add warning GUI prefab
Add Subject + MaxSpeed @ Incident
Add Selected-Tram-menu
Adhere to maximum speed due to incident
Warning buttons hooked