Finalizing blood trails

Makes trail_holder a child of cleanables instead of blood (this is to
allow add_blood turf proc to spawn blood splatter on blood trails, also
other kinds of blood effects), also cleaned up the blood code a bit.

Big props to Aranclanos, Cheridan, Pewtershmitz and all other coders on
#coderbus for making this happen.

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

@@ -18,8 +18,9 @@
 
 /obj/effect/decal/cleanable/blood/New()
 	..()
-	if(istype(src, /obj/effect/decal/cleanable/blood/gibs))
-		return
+	remove_ex_blood()
+
+/obj/effect/decal/cleanable/blood/proc/remove_ex_blood() //removes existant blood on the turf
 	if(src.loc && isturf(src.loc))
 		for(var/obj/effect/decal/cleanable/blood/B in src.loc)
 			if(B != src)
@@ -34,23 +35,17 @@
 	gender = PLURAL
 	random_icon_states = null
 
-/*/obj/effect/decal/cleanable/blood/trails
-	icon_state = "trails"
-	desc = "redrum"
-	gender = PLURAL
-	random_icon_states = null
-/obj/effect/decal/cleanable/blood/ltrails
-	icon_state = "ltrails"
-	desc = "Looks like someone forgot their bodybags."
-	gender = PLURAL
-	random_icon_states = null
-*/
-/obj/effect/decal/cleanable/blood/trail_holder
+/obj/effect/decal/cleanable/trail_holder //not a child of blood on purpose
+	name = "blood"
 	icon_state = "blank"
 	desc = "Your instincts say you shouldn't be following these."
 	gender = PLURAL
+	density = 0
+	anchored = 1
+	layer = 2
 	random_icon_states = null
-	var/existing_dirs = list()
+	var/list/existing_dirs = list()
+	blood_DNA = list()
 
 /obj/effect/decal/cleanable/blood/gibs
 	name = "gibs"
@@ -63,6 +58,9 @@
 	icon_state = "gibbl5"
 	random_icon_states = list("gib1", "gib2", "gib3", "gib4", "gib5", "gib6")
 
+/obj/effect/decal/cleanable/blood/gibs/remove_ex_blood()
+    return
+
 /obj/effect/decal/cleanable/blood/gibs/up
 	random_icon_states = list("gib1", "gib2", "gib3", "gib4", "gib5", "gib6","gibup1","gibup1","gibup1")