The real slips rewrite (#22490)

* Fix a bug in forceMove

Don't call Exited/Entered if the loc is the same

* Added forced_movement

* Remove usages comment

Fixed a parameters bug

* Refactor slips

* Refactors meathook

* Negative check

* Shittier syntax, more performance

* Seperation of src and args

* Sanity check

Because you know someone will fuck it up

* X to Y is inclusive

* Bettter diagonals

* Remove unused var

* Better suggestion

* This was never used, why was it here?

* Arg prefixing...

* Better cleanup

* Do not touch the self managing var

* Cleanup

* More cleanup

* Missed 2

* Added callbacks

* Fix ice again

* Sanity checks

* Applied to larva/attack_hulk

* Fix the chain's usage

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code/modules/mining/lavaland/necropolis_chests.dm

@@ -193,14 +193,18 @@
 	if(firer)
 		chain = firer.Beam(src, icon_state = "chain", time = INFINITY, maxdistance = INFINITY)
 	..()
+	//TODO: root the firer until the chain returns
 
 /obj/item/projectile/hook/on_hit(atom/target)
 	. = ..()
-	if(isliving(target))
-		var/mob/living/L = target
-		if(!L.anchored)
-			L.visible_message("<span class='danger'>[L] is snagged by [firer]'s hook!</span>")
-			L.forceMove(get_turf(firer))
+	if(istype(target, /atom/movable))
+		var/atom/movable/A = target
+		if(A.anchored)
+			return
+		A.visible_message("<span class='danger'>[A] is snagged by [firer]'s hook!</span>")
+		new /datum/forced_movement(A, get_turf(firer), 5, TRUE)
+		//TODO: keep the chain beamed to A
+		//TODO: needs a callback to delete the chain
 
 /obj/item/projectile/hook/Destroy()
 	qdel(chain)