Merge pull request #32311 from kevinz000/component_forensics

MoreRobustThanYou's datum forensics but it's a component this time.
Fully refactors forensics, including fingerprints, hidden/admin fingerprints, suit/clothing/whatever fibers, and blood DNA residue to /datum/component/forensics.
Adds support for manually adding fingerprints.
🆑
code: Forensics is now a datum component.
balance: NPC humans will now start leaving fingerprints on things they touch!
/🆑

code/game/objects/effects/decals/cleanable.dm

@@ -79,14 +79,11 @@
 				add_blood = bloodiness
 			bloodiness -= add_blood
 			S.bloody_shoes[blood_state] = min(MAX_SHOE_BLOODINESS,S.bloody_shoes[blood_state]+add_blood)
-			if(blood_DNA && blood_DNA.len)
-				S.add_blood(blood_DNA)
+			S.add_blood_DNA(return_blood_DNA())
 			S.blood_state = blood_state
 			update_icon()
 			H.update_inv_shoes()
 
-
-
 /obj/effect/decal/cleanable/proc/can_bloodcrawl_in()
 	if((blood_state != BLOOD_STATE_OIL) && (blood_state != BLOOD_STATE_NOT_BLOODY))
 		return bloodiness

code/game/objects/effects/decals/cleanable/aliens.dm

@@ -6,10 +6,13 @@
 	icon = 'icons/effects/blood.dmi'
 	icon_state = "xfloor1"
 	random_icon_states = list("xfloor1", "xfloor2", "xfloor3", "xfloor4", "xfloor5", "xfloor6", "xfloor7")
-	blood_DNA = list("UNKNOWN DNA" = "X*")
 	bloodiness = MAX_SHOE_BLOODINESS
 	blood_state = BLOOD_STATE_XENO
 
+/obj/effect/decal/cleanable/xenoblood/Initialize()
+	. = ..()
+	add_blood_DNA(list("UNKNOWN DNA" = "X*"))
+
 /obj/effect/decal/cleanable/xenoblood/xsplatter
 	random_icon_states = list("xgibbl1", "xgibbl2", "xgibbl3", "xgibbl4", "xgibbl5")
 
@@ -62,4 +65,7 @@
 /obj/effect/decal/cleanable/blood/xtracks
 	icon_state = "xtracks"
 	random_icon_states = null
-	blood_DNA = list("UNKNOWN DNA" = "X*")
+
+/obj/effect/decal/cleanable/blood/xtracks/Initialize()
+	. = ..()
+	add_blood_DNA(list("Unknown DNA" = "X*"))

code/game/objects/effects/decals/cleanable/humans.dm

@@ -4,13 +4,11 @@
 	icon = 'icons/effects/blood.dmi'
 	icon_state = "floor1"
 	random_icon_states = list("floor1", "floor2", "floor3", "floor4", "floor5", "floor6", "floor7")
-	blood_DNA = list()
 	blood_state = BLOOD_STATE_HUMAN
 	bloodiness = MAX_SHOE_BLOODINESS
 
 /obj/effect/decal/cleanable/blood/replace_decal(obj/effect/decal/cleanable/blood/C)
-	if (C.blood_DNA)
-		blood_DNA |= C.blood_DNA.Copy()
+	add_blood_DNA(C.return_blood_DNA())
 	..()
 
 /obj/effect/decal/cleanable/blood/old
@@ -21,7 +19,7 @@
 /obj/effect/decal/cleanable/blood/old/Initialize(mapload, list/datum/disease/diseases)
 	. = ..()
 	icon_state += "-old" //This IS necessary because the parent /blood type uses icon randomization.
-	blood_DNA["Non-human DNA"] = "A+"
+	add_blood_DNA(list("Non-human DNA" = "A+"))
 
 /obj/effect/decal/cleanable/blood/splatter
 	random_icon_states = list("gibbl1", "gibbl2", "gibbl3", "gibbl4", "gibbl5")
@@ -37,11 +35,9 @@
 	desc = "Your instincts say you shouldn't be following these."
 	random_icon_states = null
 	var/list/existing_dirs = list()
-	blood_DNA = list()
 
 /obj/effect/decal/cleanable/trail_holder/can_bloodcrawl_in()
-	return 1
-
+	return TRUE
 
 /obj/effect/decal/cleanable/blood/gibs
 	name = "gibs"
@@ -100,8 +96,7 @@
 	. = ..()
 	setDir(pick(1,2,4,8))
 	icon_state += "-old"
-	blood_DNA["Non-human DNA"] = "A+"
-
+	add_blood_DNA(list("Non-human DNA" = "A+"))
 
 /obj/effect/decal/cleanable/blood/drip
 	name = "drips of blood"
@@ -111,9 +106,8 @@
 	bloodiness = 0
 	var/drips = 1
 
-
 /obj/effect/decal/cleanable/blood/drip/can_bloodcrawl_in()
-	return 1
+	return TRUE
 
 
 //BLOODY FOOTPRINTS
@@ -151,7 +145,7 @@
 			if (!(exited_dirs & H.dir))
 				exited_dirs |= H.dir
 				update_icon()
-			
+
 
 /obj/effect/decal/cleanable/blood/footprints/update_icon()
 	cut_overlays()

code/game/objects/effects/spawners/gibspawner.dm

@@ -30,9 +30,9 @@
 					digester.stomach_contents += gib
 
 				if(MobDNA)
-					gib.blood_DNA[MobDNA.unique_enzymes] = MobDNA.blood_type
+
 				else if(istype(src, /obj/effect/gibspawner/generic)) // Probably a monkey
-					gib.blood_DNA["Non-human DNA"] = "A+"
+					gib.add_blood_DNA(list("Non-human DNA" = "A+"))
 				var/list/directions = gibdirections[i]
 				if(isturf(loc))
 					if(directions.len)