Adds New PoI Features + Bonus PoI (#5796)

* Adds cliffs.

* Finishes lava and polishes the other things.

* Hopefully finished with all the new shinies.

code/game/objects/structures.dm

@@ -3,9 +3,11 @@
 	w_class = ITEMSIZE_NO_CONTAINER
 
 	var/climbable
+	var/climb_delay = 3.5 SECONDS
 	var/breakable
 	var/parts
 	var/list/climbers = list()
+	var/block_turf_edges = FALSE // If true, turf edge icons will not be made on the turf this occupies.
 
 /obj/structure/Destroy()
 	if(parts)
@@ -99,7 +101,7 @@
 	usr.visible_message("<span class='warning'>[user] starts climbing onto \the [src]!</span>")
 	climbers |= user
 
-	if(!do_after(user,(issmall(user) ? 20 : 34)))
+	if(!do_after(user,(issmall(user) ? climb_delay * 0.6 : climb_delay)))
 		climbers -= user
 		return