Can no longer use utensils to eat if you lack the means.

Humanoid mobs can no longer eat when missing a mouth or when their mouth is blocked when using utensils, same as when eating food directly.
Fixes  #11333.

code/modules/mob/living/carbon/human/human_helpers.dm

@@ -0,0 +1,11 @@
+/mob/living/carbon/human/proc/can_eat(var/food, var/feedback = 1)
+	if(!check_has_mouth())
+		if(feedback)
+			src << "Where do you intend to put \the [food]? You don't have a mouth!"
+		return 0
+	var/obj/item/blocked = check_mouth_coverage()
+	if(blocked)
+		if(feedback)
+			src << "<span class='warning'>\The [blocked] is in the way!</span>"
+		return 0
+	return 1