feat(balance): buff fingertip razor bionic, take 2

[chaosvolt]

Purpose of change

This grab the ideas yay/phoenix brought up in #4556 plus the required hardcode changes. Idea is adding more utility to a bionic described as install 4 cm each of high-tech razor blades into your fingers, which logically should be more on par with some claw mutations while being better for cutting.

Currently WIP because I also intend to update the bonus unarmed damage but that's C++ stuff, and currently out and about on wifi. Also part of intended functioning seems to need a hardcode touching up too, see testing below.

Describe the solution

C++ changes:

1. In character_display.cpp, updated the per_hand value in character_display::display_empty_handed_base_damage from 4 to 9, to match the total damage being added per yay's intended implementation.
2. In melee.cpp, updated Character::roll_cut_damage to give a per_hand bonus of 9, so that the total damage of fingertip razors with both hands available becomes 18, as per the initial PR.
3. And also in melee.cpp, removed the bonus stabbing damage for fingertip razors from Character::roll_stab_damage, making it the bonus all one damage type instead of a weird mix of both.

JSON changes:

1. Grabbed the changes that buff the finger razor fake item's tool qualities up to 15 butcher quality, 1 cutting quality, and 2 fine cutting quality. Also added a comment explaining where the bonus damage actually is.
2. Added the description changes to the bionic and its item form, hinting at the tool usage it gains.

Describe alternatives you've considered

1. Keeping the unarmed damage bonuses unchanged.
2. Hacking in a pure JSON method of specifying bonus unarmed damage by having the razors grant an enchantment the grants a mutation that grants unarmed damage like claws do, and removing the hardcode stuff entirely.

Testing

1. Checked affected JSON files for syntax and lint errors.
2. Ported JSON changes to playthrough build and spawned in as a razor boy.
3. Dumped my starting tools and confirmed I was still able to butcher and dissect corpses.
4. Compiled and load-tested.

Problem: it recognizes I have access to cutting quality for the sake of butchering and even for crafting recipes that require cutting quality, but it won't let me salvage clothing items with them.

Additional context

Checklist

[chaosvolt]

So I'm looking at the code for salvaging and it seems to be dependent on the item having a use action. Fake items in this context it seems can't be accessed for their use actions it seems, so this might be harder than expected. Might be a deeper problem best tackled in a follow-up PR...

[scarf005]

aaaa hardcoded values aaaaaaa