feat(balance): throwing weapons sanity-checking

[chaosvolt]

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Purpose of change

followup of #5088.

Scarf said to just PR this as a draft to look at. WIP because this fucking nonsense is producing wildly different results despite seemingly near-identical input:

Also the item.cpp version of the function is fucking up and adding the weight of the weapon the ammo is loaded into, but we're not even remotely close to fixing that fuckery just yet.

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Testing

Additional context

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[chaosvolt]

So, throwing rocks at 12 in stats and 10 throwing skill deals about 12 damage prior to this change, and about 19 with the change. I'm trying to figure out where I bungled the math in the process of writing this.