feat: armor penetration for melee weapons [WIP]

[Soadreqm]

Checklist

Required

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

The game supports armour penetration values for attacks, both flat and percentage. These were actually possible to define for melee weapons, but weren't considered in the melee weapon damage rolls.

I'm not sure if it's really a good idea to add armour penetration to real items, but it's still nice to have the functionality.

Describe the solution

So far I've just added a couple helper functions to damage_instance to get the armour modifiers, and checked them in melee attacks. The numbers aren't correctly displayed when examining an item, but from initial testing they're clearly doing something

Describe alternatives you've considered

Testing

Use the provided chaos dagger.

Additional context

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