feat(balance): rare itemgroup has good items, only spawn it in armories

[RoyalFox2140]

Checklist

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• I wrote the PR title in conventional commit format.
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Purpose of change

Rare was being rolled in spider basements, rat caves, and specific map extras. This PR is a tradeoff that ensures only good items are in the item group, but it only spawns in lab and military armories.

Describe the solution

Labs have 61 shelves, each has a 2% chance to roll once. Military bases have two rolls at 20% but military bases already can spawn power armor and other good guns. I took all the garbage items out so no more computer parts or pants. I replaced world spawns of "rare" with "military"

Describe alternatives you've considered

More locations and more rare loot table changes

Testing

Tests, primarily. Here's what 1000 rare spawns look like.

Additional context

The inevitable result of me getting tired of plasma rifle spawns in the forest. Someone will put it back later I'm sure, which is fine for modded runs.