Medical changes 2022

[freghar]

These are the medical changes approved on 2022-11-04 monthly meeting, summarized on https://www.carpenoctem.co/forums/m/26081621/viewthread/33732237-feedback-thread-medical-changes-2022-edition/ .

I've tried splitting it up into commits to make it more readable, and I have also split off the hitpoint-healing into its own subfolder to make it easy to remove in case it breaks on ACE update in some distant future and there's nobody to fix it.

Note that the current code is incompatible with a potentially upcoming change in ACE, acemod/ACE3#8926 (currently scheduled for 3.16, but it's been open for a while, so who knows). Once that gets merged, we'll need to do some small tweaks to our code (interfacing with a wounds hashmap instead of an array), but that should be a fairly small change.

These changes are to be used with

force force ace_medical_playerDamageThreshold = 1;
force force ace_medical_fatalDamageSource = 1;
force force ace_medical_treatment_clearTrauma = 0;
force force ace_medical_bleedingCoefficient = 0.8;
force force ace_medical_deathChance = 0.2;
force force ace_medical_spontaneousWakeUpChance = 0.15;

as agreed upon on the monthly meeting.