More light types options for sirens

[Crowdigger]

In the .eml file, you can configure how coronas will be displayed in the game.

• Setting the value to 0 will make it visible only when viewed from behind.
• With a value of 1, it's visible only from the front.
• With a value of 2, it will be visible from all sides.

It would be useful to be able to use values 5 for left and 6 for right. This would be helpful in many cases. I think it's not good to use values 3 and 4, as some mods already use them, and currently in ImVehFT, from value 3 onwards, they act the same as all others equal to value 0.