Pacifies all pets spawned by Xenobiology's Stabilized Gold (#11350)

* changed stabilized gold intent to 'help'

* registered own proc on signal to cancel attack

* replaced signal with pacifism trait, nulled damage

* removes toggle mode verb from parrots and consistency changes

* replaced hardcoded string with macro

code/modules/research/xenobiology/crossbreeding/_status_effects.dm

@@ -938,6 +938,10 @@
 	var/obj/item/slimecross/stabilized/gold/linked = linked_extract
 	if(QDELETED(familiar))
 		familiar = new linked.mob_type(get_turf(owner.loc))
+		familiar.a_intent = INTENT_HELP
+		ADD_TRAIT(familiar, TRAIT_PACIFISM, "stabilizedgold")
+		familiar.melee_damage = 0
+		familiar.remove_verb(/mob/living/simple_animal/parrot/proc/toggle_mode) // just in case
 		familiar.name = linked.mob_name
 		familiar.del_on_death = TRUE
 		familiar.copy_languages(owner, LANGUAGE_MASTER)