Changes on how some simple hostile mobs search for targets, they now make a list of mobs at sight with the heareable() proc and add the mechs of a new global list instead of checking all the atoms in a radius of 21x21.

The new global list is called mechas_list, it contains all the mechs (sadly the 8 mechs of centcomm are added to this list, just to avoid problems with other servers with different maps)
Clowns, goats and spiders still use the old way to track targets (the view() proc).

The goal of this commit is to reduce lag, it will be really noticeable on the carp migration event, they should be 70% less laggy.

git-svn-id: http://tgstation13.googlecode.com/svn/trunk@5820 316c924e-a436-60f5-8080-3fe189b3f50e

code/modules/mob/living/simple_animal/hostile/bear.dm

@@ -61,7 +61,7 @@
 			stop_automated_movement = 1
 			stance_step++
 			if(stance_step >= 10) //rests for 10 ticks
-				if(target_mob && target_mob in ListTargets())
+				if(target_mob && target_mob in ListTargets(10))
 					stance = HOSTILE_STANCE_ATTACK //If the mob he was chasing is still nearby, resume the attack, otherwise go idle.
 				else
 					stance = HOSTILE_STANCE_IDLE
@@ -69,7 +69,7 @@
 		if(HOSTILE_STANCE_ALERT)
 			stop_automated_movement = 1
 			var/found_mob = 0
-			if(target_mob && target_mob in ListTargets())
+			if(target_mob && target_mob in ListTargets(10))
 				if(!(SA_attackable(target_mob)))
 					stance_step = max(0, stance_step) //If we have not seen a mob in a while, the stance_step will be negative, we need to reset it to 0 as soon as we see a mob again.
 					stance_step++

code/modules/mob/living/simple_animal/hostile/giant_spider.dm

@@ -100,7 +100,7 @@
 	..()
 	if(!stat)
 		if(stance == HOSTILE_STANCE_IDLE)
-			var/list/can_see = ListTargets()
+			var/list/can_see = view(src, 10)
 			//30% chance to stop wandering and do something
 			if(!busy && prob(30))
 				//first, check for potential food nearby to cocoon

code/modules/mob/living/simple_animal/hostile/hostile.dm

@@ -18,7 +18,7 @@
 
 	var/atom/T = null
 	stop_automated_movement = 0
-	for(var/atom/A in ListTargets())
+	for(var/atom/A in ListTargets(10))
 
 		if(A == src)
 			continue
@@ -40,6 +40,8 @@
 					T = L
 					break
 
+		else
+			if (can_see(src, A, 10))
 		if(istype(A, /obj/mecha))
 			var/obj/mecha/M = A
 			if (M.occupant)
@@ -63,7 +65,7 @@
 	stop_automated_movement = 1
 	if(!target_mob || SA_attackable(target_mob))
 		stance = HOSTILE_STANCE_IDLE
-	if(target_mob in ListTargets())
+	if(target_mob in ListTargets(10))
 		if(ranged)
 			if(get_dist(src, target_mob) <= 6)
 				OpenFire(target_mob)
@@ -79,7 +81,7 @@
 	if(!target_mob || SA_attackable(target_mob))
 		LoseTarget()
 		return 0
-	if(!(target_mob in ListTargets()))
+	if(!(target_mob in ListTargets(10)))
 		LostTarget()
 		return 0
 	if(get_dist(src, target_mob) <= 1)	//Attacking
@@ -109,8 +111,10 @@
 	walk(src, 0)
 
 
-/mob/living/simple_animal/hostile/proc/ListTargets()
-	return view(src, 10)
+/mob/living/simple_animal/hostile/proc/ListTargets(var/dist = 7)
+	var/list/L = hearers(src, dist)
+	L += mechas_list
+	return L
 
 /mob/living/simple_animal/hostile/Die()
 	..()

code/modules/mob/living/simple_animal/hostile/mimic.dm

@@ -77,7 +77,7 @@
 
 /mob/living/simple_animal/hostile/mimic/crate/ListTargets()
 	if(attempt_open)
-		return view(src, 10)
+		return ..()
 	return view(src, 1)
 
 /mob/living/simple_animal/hostile/mimic/crate/FindTarget()
@@ -149,7 +149,8 @@ var/global/list/protected_objects = list(/obj/structure/table, /obj/structure/ca
 
 /mob/living/simple_animal/hostile/mimic/copy/ListTargets()
 	// Return a list of targets that isn't the creator
-	return view(src, 7) - creator
+	. = ..()
+	return . - creator
 
 /mob/living/simple_animal/hostile/mimic/copy/proc/CopyObject(var/obj/O, var/mob/living/creator)