Dynamic Human Icon Generation For Simple/Basic Mobs (& Cardboard Cutouts) (#72517)

## About The Pull Request
revive of #68760
this time a proc, not an element
this time supports cardboard cutouts
this time supports mob corpses

![image](https://user-images.githubusercontent.com/23585223/211064291-81070650-189f-4afa-8116-81b687e3ea35.png)

## Why It's Good For The Game
prevents these icons ever being outdated, they'll always look what they
are supposed to, saves spriting work

## Changelog
🆑 Fikou, a hood by Viro
refactor: humanoid mobs and cardboard cutouts automatically generate
their sprites, they no longer will be outdated
/🆑

Co-authored-by: Time-Green <timkoster1@hotmail.com>

code/modules/projectiles/projectile/bullets/rifle.dm

@@ -6,6 +6,9 @@
 	armour_penetration = 30
 	wound_bonus = -40
 
+/obj/projectile/bullet/a556/weak //centcom
+	damage = 20
+
 /obj/projectile/bullet/a556/phasic
 	name = "5.56mm phasic bullet"
 	icon_state = "gaussphase"