feat(balance): Buff supply drop items, rework their item spawning

[RobbieNeko]

Why should this PR be merged?

Supply drops are known for spawning very few items, and in general being very inconsistent on their value. This changes that by buffing their spawned items a good amount and getting rid of some of the silliness that they had with spawning their items. Should hopefully cut down on the disappointing crates.

What does this PR do?

• Changes the number of crates spawned from 1-5 to 3-7
• Rolls multiple times for itemgroups for the same crate
  • Places the itemgroup ids into a vector, then iterates over that vector when it comes time to spawn items
• Rolls for 4 items instead of 2, and does it infinitely more sensibly
• Makes sure that the return of the item-placing function isn't discarded and the variable to put a use for it isn't unused.

Steps to test and verify this PR

• Compile test
• Load into the game
• Spawn a supply drop
• Examine the crates
• See the loot

Checklist

Mandatory

• I wrote the PR title in conventional commit format.
• I ran the code formatter.
• I linked any relevant issues using github keyword syntax like closes #1234 in Summary of the PR so it can be closed automatically.
• I've committed my changes to new branch that isn't main so it won't cause conflict when updating main branch later.

Additional notes

Compiled and tested on my machine, it works for me

I'm leaving the balancing of the itemgroups to someone else

[autofix-ci]

Autofix has formatted code style violation in this PR.

I edit commits locally (e.g: git, github desktop) and want to keep autofix

1. Run git pull. this will merge the automated commit into your local copy of the PR branch.
2. Continue working.

I do not want the automated commit

1. Format your code locally, then commit it.
2. Run git push --force to force push your branch. This will overwrite the automated commit on remote with your local one.
3. Continue working.

If you don't do this, your following commits will be based on the old commit, and cause MERGE CONFLICT.