Arranges lots of things into planes (#5072)

* Rearranges a billion things into planes

* Make cryotubes fancy

* Update Travis

* Fix hiding logic

code/modules/tables/flipping.dm

@@ -84,7 +84,8 @@
 
 	set_dir(direction)
 	if(dir != NORTH)
-		layer = 5
+		plane = MOB_PLANE
+		layer = ABOVE_MOB_LAYER
 	climbable = 0 //flipping tables allows them to be used as makeshift barriers
 	flipped = 1
 	flags |= ON_BORDER
@@ -102,7 +103,7 @@
 	verbs -=/obj/structure/table/proc/do_put
 	verbs +=/obj/structure/table/verb/do_flip
 
-	layer = initial(layer)
+	reset_plane_and_layer()
 	flipped = 0
 	climbable = initial(climbable)
 	flags &= ~ON_BORDER

code/modules/tables/tables.dm

@@ -6,7 +6,7 @@
 	density = 1
 	anchored = 1
 	climbable = 1
-	layer = 2.8
+	layer = UNDER_JUNK_LAYER
 	throwpass = 1
 	surgery_odds = 66
 	var/flipped = 0