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

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CHANGELOG:
v1.2.0:
- 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)

v1.1.0:
- FIX: Corrected the motor start event causing thick white smoke (or no smoke) after the engine got warm
- FIX: Exhaust smoke should no longer be solid white in certain conditions (especially an issue in multiplayer)