Make emergency vehicles drive faster

[Rainer Hilmer]

For less working my nerves emergency vehicles which have an activated siren should drive faster and disobey the traffic laws when car clearers are called or mad drivers are triggered. Override the config settings for those. Make a new config entry <OverrideSettingsForEmergencyVehicles>true/false</OverrideSettingsForEmergencyVehicles>

[Rainer Hilmer]

Override vehicles with active siren only.