Improved Exhaust Effects v 1.2

Improves the exhaust smoke effects of motorized vehicles:
– Darkens the smoke with vehicles without AdBlue (except for electric and methane powered vehicles)
– The amount of smoke varies depending on the engine temperature
– Motor load also influences exhaust smoke intensity
– Enhanced effect when starting the engine

Note: All effects (except the darker smoke) applies to all vehicles with exhaust effects, no matter if they are using AdBlue or not

Version 1.2:
* NEW: Motor load now also influences exhaust smoke density
* NEW: Now works with vehicles that have multiple exhaust effects
* FIX: Adjusted smoke density factors for better visual effect
* FIX: Resolved an issue where some vehicle types caused script errors (e.g. electric vehicles)