Gives internal organs passive regeneration (#18470)

* Organ heal

* Changes

* Use the config

code/modules/organs/internal/_organ_internal.dm

@@ -5,12 +5,26 @@
 	var/dead_icon // Icon to use when the organ has died.
 
 	var/supply_conversion_value = 0
+	var/healing_factor = 0.005 // How much this organ will heal passively
 
 /obj/item/organ/internal/Initialize(mapload, internal)
 	. = ..()
 	if(supply_conversion_value)
 		AddElement(/datum/element/sellable/organ)
 
+/obj/item/organ/internal/process()
+	..()
+	passive_heal()
+
+// Heals the internal organ passively as long as it's under the bruised threshold
+// Not a lot of MATH just yet, but nutrition or other factors could be taken into account
+/obj/item/organ/internal/proc/passive_heal()
+	if(!is_bruised() && !is_broken())
+		return
+
+	var/heal_amt = healing_factor * CONFIG_GET(number/organ_regeneration_multiplier)
+	damage = max(damage - heal_amt, 0)
+
 /obj/item/organ/internal/die()
 	..()
 	if((status & ORGAN_DEAD) && dead_icon)