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

* LDFJAHDJKAGFHLJKDSAGHJKLSDAGBLKJADGFHKLJADGNLKAMDFNBJK:ANFDJKLADSNLSJKDFHNASFADSFLK:AJFL:KASJFKLASJF:LAJSF:LKJASKFMSALKF

code/game/objects/structures.dm

@@ -64,6 +64,12 @@
 		step(O, get_dir(O, src))
 	return
 
+/obj/structure/proc/do_climb(atom/movable/A)
+	if(climbable)
+		density = 0
+		. = step(A,get_dir(A,src.loc))
+		density = 1
+
 /obj/structure/proc/climb_structure(mob/user)
 	src.add_fingerprint(user)
 	user.visible_message("<span class='warning'>[user] starts climbing onto [src].</span>", \
@@ -76,8 +82,7 @@
 	structureclimber = user
 	if(do_mob(user, user, adjusted_climb_time))
 		if(src.loc) //Checking if structure has been destroyed
-			density = 0
-			if(step(user,get_dir(user,src.loc)))
+			if(do_climb(user))
 				user.visible_message("<span class='warning'>[user] climbs onto [src].</span>", \
 									"<span class='notice'>You climb onto [src].</span>")
 				add_logs(user, src, "climbed onto")
@@ -85,7 +90,6 @@
 				. = 1
 			else
 				user << "<span class='warning'>You fail to climb onto [src].</span>"
-			density = 1
 	structureclimber = null
 
 /obj/structure/examine(mob/user)