Changes types of ghosts and eyes

``/mob/dead/observer`` -> ``/mob/observer/dead``
``/mob/eye`` -> ``/mob/observer/eye``

Reason being that they are similar in that they both don't interact with
the world in any way. Some procs were shared, some checks as well, and
it overall makes more sense this way. Plus, there were no ``/mob/dead``
mobs.

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

@@ -109,7 +109,7 @@ var/global/list/obj/item/device/communicator/all_communicators = list()
 		if(!comm || !comm.exonet || !comm.exonet.address || comm.exonet.address == src.exonet.address) //Don't add addressless devices, and don't add ourselves.
 			continue
 		src.known_devices |= comm
-	for(var/mob/dead/observer/O in dead_mob_list)
+	for(var/mob/observer/dead/O in dead_mob_list)
 		if(!O.client || O.client.prefs.communicator_visibility == 0)
 			continue
 		src.known_devices |= O
@@ -157,13 +157,13 @@ var/global/list/obj/item/device/communicator/all_communicators = list()
 	populate_known_devices() //Update the devices so ghosts can see the list on NanoUI.
 	..()
 
-/mob/dead/observer
+/mob/observer/dead
 	var/datum/exonet_protocol/exonet = null
 
 // Proc: New()
 // Parameters: None
 // Description: Gives ghosts an exonet address based on their key and ghost name.
-/mob/dead/observer/New()
+/mob/observer/dead/New()
 	. = ..()
 	spawn(20)
 		exonet = new(src)
@@ -175,7 +175,7 @@ var/global/list/obj/item/device/communicator/all_communicators = list()
 // Proc: Destroy()
 // Parameters: None
 // Description: Removes the ghost's address and nulls the exonet datum, to allow qdel()ing.
-/mob/dead/observer/Destroy()
+/mob/observer/dead/Destroy()
 	. = ..()
 	if(exonet)
 		exonet.remove_address()
@@ -200,7 +200,7 @@ var/global/list/obj/item/device/communicator/all_communicators = list()
 			communicators[++communicators.len] = list("name" = sanitize(comm.name), "address" = comm.exonet.address)
 
 	//Now for ghosts who we pretend have communicators.
-	for(var/mob/dead/observer/O in known_devices)
+	for(var/mob/observer/dead/O in known_devices)
 		if(O.client && O.client.prefs.communicator_visibility == 1 && O.exonet)
 			communicators[++communicators.len] = list("name" = sanitize("[O.client.prefs.real_name]'s communicator"), "address" = O.exonet.address)
 
@@ -210,7 +210,7 @@ var/global/list/obj/item/device/communicator/all_communicators = list()
 			invites[++invites.len] = list("name" = sanitize(comm.name), "address" = comm.exonet.address)
 
 	//Ghosts we invited.
-	for(var/mob/dead/observer/O in voice_invites)
+	for(var/mob/observer/dead/O in voice_invites)
 		if(O.exonet && O.client)
 			invites[++invites.len] = list("name" = sanitize("[O.client.prefs.real_name]'s communicator"), "address" = O.exonet.address)
 
@@ -220,7 +220,7 @@ var/global/list/obj/item/device/communicator/all_communicators = list()
 			requests[++requests.len] = list("name" = sanitize(comm.name), "address" = comm.exonet.address)
 
 	//Ghosts that want to talk to us.
-	for(var/mob/dead/observer/O in voice_requests)
+	for(var/mob/observer/dead/O in voice_requests)
 		if(O.exonet && O.client)
 			requests[++requests.len] = list("name" = sanitize("[O.client.prefs.real_name]'s communicator"), "address" = O.exonet.address)
 
@@ -342,7 +342,7 @@ var/global/list/obj/item/device/communicator/all_communicators = list()
 // Proc: receive_exonet_message()
 // Parameters: 3 (origin atom - the source of the message's holder, origin_address - where the message came from, message - the message received)
 // Description: Handles voice requests and invite messages originating from both real communicators and ghosts.  Also includes a ping response.
-/mob/dead/observer/receive_exonet_message(origin_atom, origin_address, message)
+/mob/observer/dead/receive_exonet_message(origin_atom, origin_address, message)
 	if(message == "voice")
 		if(istype(origin_atom, /obj/item/device/communicator))
 			var/obj/item/device/communicator/comm = origin_atom
@@ -600,7 +600,7 @@ var/global/list/obj/item/device/communicator/all_communicators = list()
 // Verb: join_as_voice()
 // Parameters: None
 // Description: Allows ghosts to call communicators, if they meet all the requirements.
-/mob/dead/verb/join_as_voice()
+/mob/observer/dead/verb/join_as_voice()
 	set category = "Ghost"
 	set name = "Call Communicator"
 	set desc = "If there is a communicator available, send a request to speak through it.  This will reset your respawn timer, if someone picks up."
@@ -643,7 +643,7 @@ var/global/list/obj/item/device/communicator/all_communicators = list()
 	var/choice = input(src,"Send a voice request to whom?") as null|anything in choices
 	if(choice)
 		var/obj/item/device/communicator/chosen_communicator = choice
-		var/mob/dead/observer/O = src
+		var/mob/observer/dead/O = src
 		if(O.exonet)
 			O.exonet.send_message(chosen_communicator.exonet.address, "voice")
 

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

@@ -156,7 +156,7 @@ var/global/list/default_medbay_channels = list(
 	var/obj/item/weapon/card/id/I = GetIdCard()
 	return has_access(list(), req_one_accesses, I ? I.GetAccess() : list())
 
-/mob/dead/observer/has_internal_radio_channel_access(var/list/req_one_accesses)
+/mob/observer/dead/has_internal_radio_channel_access(var/list/req_one_accesses)
 	return can_admin_interact()
 
 /obj/item/device/radio/proc/text_wires()

code/game/objects/items/robot/robot_parts.dm

@@ -185,7 +185,7 @@
 			if(!M.brainmob.key)
 				var/ghost_can_reenter = 0
 				if(M.brainmob.mind)
-					for(var/mob/dead/observer/G in player_list)
+					for(var/mob/observer/dead/G in player_list)
 						if(G.can_reenter_corpse && G.mind == M.brainmob.mind)
 							ghost_can_reenter = 1
 							break

code/game/objects/items/robot/robot_upgrades.dm

@@ -67,7 +67,7 @@
 		return 0
 
 	if(!R.key)
-		for(var/mob/dead/observer/ghost in player_list)
+		for(var/mob/observer/dead/ghost in player_list)
 			if(ghost.mind && ghost.mind.current == R)
 				R.key = ghost.key