Move synth charging to the stomach, implement wind-up key and synth charging method prefs

[00-Steven]

About The Pull Request

In this PR we entirely move synth charging to be on the stomach instead of the species, allow them to pick which stomach type they use, and add a wind-up key as a secondary option.
We broadly clean up the charging code somewhat in doing this.
We also unify the charge values, making all of them depend on the basic max charge.

The wind-up key requires a second person to charge, who needs to stand behind you to do this.

Why It's Good For The Game

Mechanics tied to the species are largely uninteractive ingame. The less things tied to things you can't interact with the better.
This allows you to make the questionable life choice of implanting a wind-up key or power cord into any other species and have it Just Work, much like ethereal stomachs. Or, for that matter, implement other charging mechanics for synths.

haha funny wind-up key go click click spinny

Testing Evidence

Changelog

🆑
refactor: Reworked synthetic species charging entirely. Please report any issues.
add: Added a wind-up key stomach replacement, requiring others to charge it for you.
add: Synthetic species can now pick their charging method, currently limited to power cord or wind-up key.
balance: Charging mechanics and lack of hunger are no longer inherent to the synthetic species, but tied to their stomach. You can find these as a medical design besides tier 2 cybernetic organs like their previous stomach.
balance: Synthetic charging rate has been very slightly altered.
balance: Synthetic will now lose some charge and spark on getting EMP'd, except for the wind-up key which is immune.
fix: Reviving someone with synthetic charging mechanics now always puts them up to 0.5MJ instead of sometimes going over.
del: Revival surgery no longer re-charges synths twice.
/:cl:

[SylvetteSylph]

Is it intended behavior to be able to charge oneself?

Also, the sprite of the charging mechanism seems to overlap the sprite from the front! Exactly two pixels on two different frames, but I felt it worth mentioning if that is able to be fixed.

[00-Steven]

charging yourself is unintended behaviour, oops
on the sprite end iirc that's supposed to be for like when you can see the bits of the key poke out behind you, so it should render behind everything else if there's anything else present- may have to do some rendering fuckery to get that to work properly

[github-actions]

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[00-Steven]

woe