Medical - Add damage handling for explosive damage while inside vehicles

[LinkIsGrim]

When merged this pull request will:

• Add damage handling for all damage from explosives while inside a vehicle. This includes mines, artillery, explosive charges, AT, explosive projectiles like 40mm grenades, and most importantly catastrophic vehicle explosions.
• Change vehicle checks in ace_medical_engine_fnc_handleDamage to objectParent. It's faster and handles dead units.

Continuation of @pterolatypus #8832. Includes #9216, should be merged alongside/after.

I wasn't able to figure out why damage from vehicle explosions can be negative, but just using abs value puts wounds at where they should be anyway.

Doesn't completely guarantee lethality from catastrophic explosions because of the random body part roll. Should it? I feel like the chance for survival is low enough anyway (have to not roll head or body six times at damage = 1).

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[PabstMirror]

might be able to remove this code after this PR
Guarantee aircraft crashes are more lethal
https://github.com/acemod/ACE3/blob/master/addons/medical_engine/XEH_postInit.sqf#L64-L76

[PabstMirror]

I understand the 6x on line 32, but not sure I get where the 6x on 33 is coming from?

[LinkIsGrim]

IIRC, scaling. Though looking at this again now I'd rather rewrite this loop.

[LinkIsGrim]

Remembered: damage here is only gotten from #structural hitpoint and only available in 0-1 range, typically very low. So it's multiplied by 6 to account for it representing damage to each limb, sorta. It feels right in game IMO.

[PabstMirror]

I think we could make this scaling a setting?
just a 0-1 lerp between old way and new

[LinkIsGrim]

Why?

[PabstMirror]

this is very subjective but I think it's ok if some explosions are survivable
e.g. hatchback setDamage 1, car's don't really explode, so I'm not sure if that should be fatal

[LinkIsGrim]

I'm okay with vehicle explosions being sometimes survivable, though that is mostly going to be handled by selectRandom ALL_BODY_PARTS.

[LinkIsGrim]

This needs testing/compatibility with AVD, as that damages crew based on damage sustained by the vehicle. Need to check if it doesn't become excessive.

[LinkIsGrim]

AVD doubles up on the damage inflicted.

[veteran29]

Code looks ok, I did not test it.

[LinkIsGrim]

Yell at me if this breaks. Focus testing concern on RC.