[MIRROR] Converts several species traits into generic traits (#5710)

* Converts several species traits into generic traits

* Update traits.dm

* Update mousetrap.dm

* Update corporate.dm

* Update jellypeople.dm

* snowflake fix

code/modules/hydroponics/grown/nettle.dm

@@ -56,11 +56,8 @@
 	var/mob/living/carbon/C = user
 	if(C.gloves)
 		return FALSE
-	if(ishuman(C))
-		var/mob/living/carbon/human/H = C
-		if(H.dna && H.dna.species)
-			if(PIERCEIMMUNE in H.dna.species.species_traits)
-				return FALSE
+	if(C.has_trait(TRAIT_PIERCEIMMUNE))
+		return FALSE
 	var/hit_zone = (C.held_index_to_dir(C.active_hand_index) == "l" ? "l_":"r_") + "arm"
 	var/obj/item/bodypart/affecting = C.get_bodypart(hit_zone)
 	if(affecting)