Code Cleanup: Destroy() fixes part 1 + Misc Fixes (#1933)

In this PR:

Destroy() fixes backported from PR #1783.
JaniPDA fixes & improvements.
Chickens no longer consume their own eggs.
Language adding in setup is now 100% more sane.
Chemical dispensers now actually check that the user is still alive before renaming.
Ghosts are now marked as non-simulated atoms.
Non-simulated atoms no longer trigger proximity listeners.
Vendors no longer accept synthetic tools as stocking options.
Fixes #812.
Fixes #1877, Fixes #1929.
Fixes #1930.
Fixes #1152, Fixes #1917.
Fixes #1902.
Fixes #1165.

code/modules/mob/dead/observer/observer.dm

@@ -13,6 +13,7 @@ var/global/list/image/ghost_sightless_images = list() //this is a list of images
 	blinded = 0
 	anchored = 1	//  don't get pushed around
 	invisibility = INVISIBILITY_OBSERVER
+	simulated = FALSE
 	var/can_reenter_corpse
 	var/datum/hud/living/carbon/hud = null // hud
 	var/bootime = 0

code/modules/mob/living/bot/cleanbot.dm

@@ -52,6 +52,8 @@ var/list/cleanbot_types // Going to use this to generate a list of types once th
 	listener = new /obj/cleanbot_listener(src)
 	listener.cleanbot = src
 
+	janitorial_supplies |= src
+
 	if(radio_controller)
 		radio_controller.add_object(listener, beacon_freq, filter = RADIO_NAVBEACONS)
 
@@ -61,6 +63,7 @@ var/list/cleanbot_types // Going to use this to generate a list of types once th
 	patrol_path = null
 	target = null
 	ignorelist = null
+	janitorial_supplies -= src
 
 /mob/living/bot/cleanbot/proc/handle_target()
 	if(target.clean_marked && target.clean_marked != src)

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

@@ -17,13 +17,10 @@
 		germ_level++
 
 /mob/living/carbon/Destroy()
-	qdel(ingested)
-	qdel(touching)
+	QDEL_NULL(touching)
 	// We don't qdel(bloodstr) because it's the same as qdel(reagents)
 	for(var/guts in internal_organs)
 		qdel(guts)
-	for(var/food in stomach_contents)
-		qdel(food)
 	return ..()
 
 /mob/living/carbon/rejuvenate()

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

@@ -39,20 +39,21 @@
 	var/obj/item/organ/external/head = get_organ("head")
 	var/mob/living/simple_animal/borer/B
 
-	for(var/I in head.implants)
-		if(istype(I,/mob/living/simple_animal/borer))
-			B = I
-	if(B)
-		if(!B.ckey && ckey && B.controlling)
-			B.ckey = ckey
-			B.controlling = 0
-		if(B.host_brain.ckey)
-			ckey = B.host_brain.ckey
-			B.host_brain.ckey = null
-			B.host_brain.name = "host brain"
-			B.host_brain.real_name = "host brain"
+	if (head)
+		for(var/I in head.implants)
+			if(istype(I,/mob/living/simple_animal/borer))
+				B = I
+		if(B)
+			if(!B.ckey && ckey && B.controlling)
+				B.ckey = ckey
+				B.controlling = 0
+			if(B.host_brain.ckey)
+				ckey = B.host_brain.ckey
+				B.host_brain.ckey = null
+				B.host_brain.name = "host brain"
+				B.host_brain.real_name = "host brain"
 
-		verbs -= /mob/living/carbon/proc/release_control
+			verbs -= /mob/living/carbon/proc/release_control
 
 	callHook("death", list(src, gibbed))
 

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

@@ -81,8 +81,30 @@
 	human_mob_list -= src
 	for(var/organ in organs)
 		qdel(organ)
-	if (DS)
-		qdel(DS)//prevents the dionastats holding onto references and blocking GC
+	organs = null
+	internal_organs_by_name = null
+	internal_organs = null
+	organs_by_name = null
+	bad_internal_organs = null
+	bad_external_organs = null
+	
+	QDEL_NULL(DS)
+	// qdel and null out our equipment.
+	QDEL_NULL(shoes)
+	QDEL_NULL(belt)
+	QDEL_NULL(gloves)
+	QDEL_NULL(glasses)
+	QDEL_NULL(head)
+	QDEL_NULL(l_ear)
+	QDEL_NULL(r_ear)
+	QDEL_NULL(wear_id)
+	QDEL_NULL(r_store)
+	QDEL_NULL(l_store)
+	QDEL_NULL(s_store)
+	QDEL_NULL(wear_suit)
+	// Do this last so the mob's stuff doesn't drop on del.
+	QDEL_NULL(w_uniform)
+
 	return ..()
 
 /mob/living/carbon/human/Stat()

code/modules/mob/living/living.dm

@@ -782,3 +782,11 @@ default behaviour is:
 	src << "<b>You are now \the [src]!</b>"
 	src << "<span class='notice'>Remember to stay in character for a mob of this type!</span>"
 	return 1
+
+/mob/living/Destroy()
+	for (var/thing in stomach_contents)
+		qdel(thing)
+	stomach_contents = null
+	QDEL_NULL(ingested)
+
+	return ..()

code/modules/mob/living/silicon/robot/robot.dm

@@ -248,6 +248,7 @@
 		connected_ai.connected_robots -= src
 	qdel(wires)
 	wires = null
+	QDEL_NULL(spark_system)
 	return ..()
 
 /mob/living/silicon/robot/proc/set_module_sprites(var/list/new_sprites)

code/modules/mob/living/simple_animal/friendly/farm_animals.dm

@@ -179,6 +179,7 @@
 	beg_for_food = 0
 	density = 0
 	mob_size = 0.75//just a rough estimate, the real value should be way lower
+	hunger_enabled = FALSE
 
 /mob/living/simple_animal/chick/New()
 	..()
@@ -227,6 +228,7 @@ var/global/chicken_count = 0
 	holder_type = /obj/item/weapon/holder/chicken
 	density = 0
 	mob_size = 2
+	hunger_enabled = FALSE
 
 /mob/living/simple_animal/chicken/New()
 	..()
@@ -256,14 +258,17 @@ var/global/chicken_count = 0
 		var/obj/item/weapon/reagent_containers/food/snacks/grown/G = O
 		if(G.seed && G.seed.kitchen_tag == "wheat")
 			if(!stat && eggsleft < 8)
-				user.visible_message("\blue [user] feeds [O] to [name]! It clucks happily.","\blue You feed [O] to [name]! It clucks happily.")
+				user.visible_message(
+					span("notice", "\The [user] feeds \the [O] to \the [name]! It clucks happily."),
+					span("notice", "You feed \the [O] to \the [name]! It clucks happily."),
+					"You hear a cluck.")
 				user.drop_item()
 				qdel(O)
 				eggsleft += rand(1, 4)
 			else
-				user << "\blue [name] doesn't seem hungry!"
+				user << "\The [name] doesn't seem hungry!"
 		else
-			user << "[name] doesn't seem interested in that."
+			user << "\The [name] doesn't seem interested in that."
 	else
 		..()
 

code/modules/mob/living/simple_animal/hostile/bear.dm

@@ -439,9 +439,8 @@
 	spark_system = bind_spark(src, 5)
 
 /mob/living/simple_animal/hostile/bear/spatial/Destroy()
-	if (spark_system)
-		qdel(spark_system)
-	..()
+	QDEL_NULL(spark_system)
+	return ..()
 
 //Called when we want to bypass ticks and attack immediately. For example in response to being shot
 //This calls several procs and some duplicated code from the parent class to immediately put us in an assault state and lash out