Make bodyBags vehicles that can carry respawning players

[PabstMirror]

Fix #1301

Can bag re-spawning players
Can still access inventory of body
Can still track original body object

Dead bodies are odd, but this seems to be working fine.

• setPos on dead bodies seems to need to be called where local
• moveInX works on bodies, but moveOut doesn't, so there still is no way to get a body out of a bag

[nicolasbadano]

Morbid bycicle ❤️

[commy2]

The class name ACE_bodyBagObject is infuriating.

[thojkooi]

This is an interesting approach. 👍 I didn't notice anything odd in the code. Has this been tested in MP?

[PabstMirror]

Just very small scale local dedi.
I'm not sure about the effects of making these vehicle simulations.
There may be negative effects on something like a persistant mission with many bags and possibly having AI react to the object being a LandVehicle.

An alternate fix would be https://github.com/acemod/ACE3/compare/playerBodybags
which just moves the locked player bodies to a corner, hides them and then deletes when free. I actually feel that would be safer, but this would offer more features (like not deleting the body object and having access to inventory)