No more multi-Z grabs, + ladder grabbing (#3025)

Grabs break if the mobs aren't on the same Z level. You also take someone you're grabbing up ladders with you.

code/modules/mob/mob_grab.dm

@@ -288,7 +288,7 @@
 		return 0
 
 	if(affecting)
-		if(!isturf(assailant.loc) || ( !isturf(affecting.loc) || assailant.loc != affecting.loc && get_dist(assailant, affecting) > 1) )
+		if(!isturf(assailant.loc) || ( !isturf(affecting.loc) || assailant.loc != affecting.loc && get_dist(assailant, affecting) > 1) || assailant.z != affecting.z )
 			qdel(src)
 			return 0
 

code/modules/multiz/structures.dm

@@ -54,9 +54,17 @@
 	var/obj/structure/ladder/target_ladder = getTargetLadder(M)
 	if(!target_ladder)
 		return
+	
+	var/obj/item/weapon/grab/G = M.l_hand
+	if (!istype(G))
+		G = M.r_hand
+	
 	if(!M.Move(get_turf(src)))
 		to_chat(M, "<span class='notice'>You fail to reach \the [src].</span>")
 		return
+	
+	if (istype(G))
+		G.affecting.forceMove(get_turf(src))
 
 	var/direction = target_ladder == target_up ? "up" : "down"
 
@@ -66,7 +74,7 @@
 
 	target_ladder.audible_message("<span class='notice'>You hear something coming [direction] \the [src]</span>")
 
-	if(do_after(M, climb_time))
+	if(do_after(M, istype(G) ? (climb_time*2) : climb_time))
 		climbLadder(M, target_ladder)
 
 /obj/structure/ladder/attack_ghost(var/mob/M)
@@ -126,6 +134,11 @@
 		if(!A.CanPass(M, M.loc, 1.5, 0))
 			to_chat(M, "<span class='notice'>\The [A] is blocking \the [src].</span>")
 			return FALSE
+	var/obj/item/weapon/grab/G = M.l_hand
+	if (!istype(G))
+		G = M.r_hand
+	if (istype(G))
+		G.affecting.forceMove(T)
 	return M.Move(T)
 
 /obj/structure/ladder/CanPass(obj/mover, turf/source, height, airflow)