Refactors faction lists to use getters and setters and be cached (#94490)

code/modules/mapfluff/ruins/lavalandruin_code/watcher_grave.dm

@@ -165,6 +165,8 @@
 
 /obj/effect/watcher_orbiter/Initialize(mapload)
 	. = ..()
+	if(LAZYLEN(target_faction))
+		target_faction = string_list(target_faction)
 	START_PROCESSING(SSobj, src)
 
 // Shuttle rotation fucks with our position, we just want to stick with our guy
@@ -182,7 +184,7 @@
 	for (var/mob/living/potential_target in oview(5, src))
 		if (!ismining(potential_target) || potential_target.stat == DEAD)
 			continue
-		if (!faction_check(target_faction, potential_target.faction))
+		if (!potential_target.has_faction(target_faction))
 			continue
 		shoot_at(potential_target)
 		return