Merge pull request #12580 from Detective-Google/ghosts

ghosts now appear at round-end (tg#51572

code/__HELPERS/mobs.dm

@@ -375,6 +375,8 @@ GLOBAL_LIST_EMPTY(species_list)
 			override = TRUE
 		if(HAS_TRAIT(M, TRAIT_SIXTHSENSE))
 			override = TRUE
+		if(SSticker.current_state == GAME_STATE_FINISHED)
+			override = TRUE
 		if(isnewplayer(M) && !override)
 			continue
 		if(M.stat != DEAD && !override)

code/__HELPERS/roundend.dm

@@ -233,6 +233,7 @@
 	for(var/antag_name in total_antagonists)
 		var/list/L = total_antagonists[antag_name]
 		log_game("[antag_name]s :[L.Join(", ")].")
+	set_observer_default_invisibility(0, "<span class='warning'>The round is over! You are now visible to the living.</span>")
 
 	CHECK_TICK
 	SSdbcore.SetRoundEnd()