oil slime logging (#15579)

code/modules/research/xenobiology/xenobiology.dm

@@ -13,7 +13,10 @@
 	throw_speed = 3
 	throw_range = 6
 	origin_tech = "biotech=3"
-	var/Uses = 1 // uses before it goes inert
+	/// Uses before it goes inert
+	var/Uses = 1
+	/// The mob who last injected the extract with plasma, water or blood. Used for logging.
+	var/mob/living/injector_mob
 
 /obj/item/slime_extract/attackby(obj/item/O, mob/user)
 	if(istype(O, /obj/item/slimepotion/enhancer))
@@ -23,6 +26,8 @@
 		to_chat(user, "<span class='notice'>You apply the enhancer to the slime extract. It may now be reused one more time.</span>")
 		Uses++
 		qdel(O)
+	if(istype(O, /obj/item/reagent_containers/syringe))
+		injector_mob = user
 	..()
 
 /obj/item/slime_extract/New()