Modify loot-to-crate to dump all leftovers to a single weapon holder

[jaj22]

What type of PR is this.

1. Bug
2. Change
3. Enhancement

What have you changed and why?

Reworked loot-to-crate to dump all the leftovers to a single weapon holder next to the looting crate. This has some likely client performance & networking advantages, and enabled easier detection of whether the leftover weapon holder could be deleted as a priority (due to only containing unlocked items).

The original code didn't differentiate between the crate-full and already-unlocked cases when looting items from bodies (only when looting other weapon holders), and there was a danger of all the additional weapon holders (typically 2-3 per corpse) filling up the postmortem queue and causing premature deletion of corpses.

As far as I can tell I didn't break anything new in the process. Test cases:

• Full squads of various types, ended with zeus.
• Locked and unlocked items of all four types.
• Filling up the box.
• Re-looting dumped weapon holders.

Please specify which Issue this PR Resolves.

closes #3447

Please verify the following and ensure all checks are completed.

1. Have you loaded the mission in LAN host?
2. Have you loaded the mission on a dedicated server?

Is further testing or are further changes required?

1. No
2. Yes (Please provide further detail below.)

Someone else should probably test it and see if they can break anything.

[ante185]

This seems to be working as advertised, might not have done the most thorough test though i tried.

It's a little jarring to have the big pile of stuff appear at your feet / by the crate, the old piles felt like they spawned more naturally, and as each had less stuff it'd be easier to see what's in the pile. not sure if regressing to the old pile spawning behaviour is worth it though.

Approving so we can throw this up on the test server and see if the overall effect is what we desired.