Casings - Add infantry bullet casings

[Cyruz143]

When merged this pull request will:

• It's a stripped down and basic version of (Port of ACE2 casings #4132).
• Only impacts infantry weapons, no vehicles etc
• Fully local, no network sync
• Has some settings (on/off, maximum amount of brass)

I've been using a version of this since 2020. It works fairly well, will have odd floating cases, especially near the edges of objects and buildings etc. I've taken most of the vector bits from the original PR, math could probably be better if anyone wants to have a go!

I've left esteldunedain in the authors as I'm using parts of his original code. Also @diwako helped me with this a while ago, happy to add you on to this too bud!

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[jonpas]

Short and neat.

[Cyruz143]

After many discussions in dev on Slack. I've switched it to use an LIS check. Because of the performance concerns, especially for something visual, I've disabled it by default.

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[Cyruz143]

Ran this PR'd version through a session and got a few people of varying hardware specs to enable it. Even during some fairly big fire fights, no-one noticed any performance impact (as I was asking them to keep an eye on stuttering/fps etc). Obviously the arma butt dyno isn't the best performance metric but it's better than nothing!

[jonpas]

I think this should be enabled by default. :)

[PabstMirror]

Bullets seem to be halfway underground
I think because it's a simple object it's placed via https://community.bistudio.com/wiki/setPosWorld (model center)
So I guess we might want to add the radius of the case to the z height (probably 4-5mm)
But it's not a big deal