Emergency vehicle overhead flasher lights! And a police car.
Aaaaaaaaaaaambulance!
Slightly lower the power of the flasher lights.
That's not how modulus works.
Future-proofing for circle lights that don't flash.
Proper initialization of overhead_lights_on.
Properly save/load overhead_lights_on state, without breaking old saves.
Emergency vehicles can spawn in cities now.
Forgot about the ambulance's side door.
Merge emergency vehicles.

Conflicts:
	data/json/vehicle_parts.json
	savegame_json.cpp
	vehicle.cpp