Changed Mercedes skin order and removed first glass texture

Changed all skins, changed Mercedes stretcher material from red to black, added second (black) skin for stretcher prop

Changed siren sounds

Added blue ELS lights for Mercedes-Benz, minor fixes for Fiat model

Fixed props, added new bodygroup for shutters

Added new car Fiat Ducato, new skin for Mercedes-Benz, updated some textures and lua

Changed car category to Mercedes-Benz

Added ELS for simfphys

Updated lights material, added correct passenger seats for simfphys, added 2 skin slots

Fixed calipers