Landmarks works (#19006)

Fixed some landmarks harddels.
Refactored various landmarks in their own subtype instead of using a
name-based switch system.

code/modules/ghostroles/spawner/base.dm

@@ -31,6 +31,7 @@
 
 	var/list/spawnpoints = null //List of the applicable spawnpoints (by name) - Use loc_type: GS_LOC_POS
 	var/landmark_name = null //Alternatively you can specify a landmark name - Use loc_type: GS_LOC_POS
+	var/landmark_type = null //Specify a landmark type to look for, instead of the name, this takes precedence over landmark_name
 
 	var/loc_type = GS_LOC_POS
 
@@ -148,10 +149,13 @@
 					spawnpoints -= spawnpoint //Set the spawnpoint at the bottom of the list.
 					spawnpoints += spawnpoint
 				return T
-	if(!isnull(landmark_name))
+	if(!isnull(landmark_name) || !isnull(landmark_type))
 		var/list/possible_landmarks = list()
 		for(var/obj/effect/landmark/landmark in GLOB.landmarks_list)
-			if(landmark.name == landmark_name)
+			if(landmark_type)
+				if(istype(landmark, landmark_type))
+					possible_landmarks += landmark
+			else if(landmark.name == landmark_name)
 				possible_landmarks += landmark
 		if(length(possible_landmarks))
 			var/obj/effect/landmark/L = pick(possible_landmarks)

code/modules/ghostroles/spawner/human/visitor.dm

@@ -4,7 +4,7 @@
 	tags = list("External")
 
 	enabled = FALSE
-	landmark_name = "JoinLate"
+	landmark_type = /obj/effect/landmark/latejoin
 	req_perms = null
 	max_count = 1