POLARIS: Fix several Destroy()s

code/datums/EPv2.dm

@@ -40,6 +40,10 @@ var/global/list/all_exonet_connections = list()
 	src.holder = holder
 	..()
 
+/datum/exonet_protocol/Destroy()
+	remove_address()
+	holder = null
+	return ..()
 
 // Proc: make_address()
 // Parameters: 1 (string - used to make into a hash that will be part of the new address)

code/datums/mixed.dm

@@ -34,8 +34,7 @@
 	data_core.medical -= src
 	data_core.general -= src
 	data_core.security -= src
-	..()
+	. = ..()
-	return QDEL_HINT_FINDREFERENCE // If we must, we can resort to QDEL_HINT_HARDDEL.  But lets see how this works in practice ~Leshana
 
 /datum/data/text
 	name = "text"

code/datums/progressbar.dm

@@ -22,8 +22,10 @@
 /datum/progressbar/Destroy()
 	if (client)
 		client.images -= bar
-	qdel(bar)
+	qdel_null(bar)
-	. = ..()
+	user = null
+	client = null
+	return ..()
 
 /datum/progressbar/proc/update(progress)
 	//world << "Update [progress] - [goal] - [(progress / goal)] - [((progress / goal) * 100)] - [round(((progress / goal) * 100), 5)]"

code/game/objects/items/devices/communicator/communicator.dm

@@ -287,17 +287,20 @@ var/global/list/obj/item/device/communicator/all_communicators = list()
 		to_chat(voice, "<span class='danger'>\icon[src] Connection timed out with remote host.</span>")
 		qdel(voice)
 	close_connection(reason = "Connection timed out")
+
+	//Clean up all references we might have to others
 	communicating.Cut()
 	voice_requests.Cut()
 	voice_invites.Cut()
+	node = null
+
+	//Clean up references that might point at us
 	all_communicators -= src
 	processing_objects -= src
 	listening_objects.Remove(src)
-	qdel(camera)
+	qdel_null(camera)
-	camera = null
+	qdel_null(exonet)
-	if(exonet)
+
-		exonet.remove_address()
-		exonet = null
 	return ..()
 
 // Proc: update_icon()

code/game/objects/items/weapons/implants/implant.dm

@@ -52,7 +52,9 @@
 /obj/item/weapon/implant/Destroy()
 	if(part)
 		part.implants.Remove(src)
+	listening_objects.Remove(src)
 	part = null
+	imp_in = null
 	return ..()
 
 /obj/item/weapon/implant/attackby(obj/item/I, mob/user)
@@ -82,7 +84,6 @@
 
 /obj/item/weapon/implant/tracking/implanted(var/mob/source)
 	processing_objects.Add(src)
-	listening_objects |= src
 	return 1
 
 /obj/item/weapon/implant/tracking/Destroy()

code/modules/mob/mob_planes.dm

@@ -94,6 +94,9 @@
 	var/invis_toggle = FALSE
 	var/list/sub_planes
 
+/obj/screen/plane_master/New()
+	..(null) //Never be in anything ever.
+
 /obj/screen/plane_master/proc/set_desired_alpha(var/new_alpha)
 	if(new_alpha != alpha && new_alpha > 0 && new_alpha <= 255)
 		desired_alpha = new_alpha

code/modules/nano/modules/nano_module.dm

@@ -5,6 +5,10 @@
 /datum/nano_module/New(var/host)
 	src.host = host
 
+/datum/nano_module/Destroy()
+	host = null
+	return ..()
+
 /datum/nano_module/nano_host()
 	return host ? host : src