Platform Fix (#3745)

## About The Pull Request
Adds platform internal corners
Fixed platform directions
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## Changelog

:cl:
add: implements thick railings from code
fix: platform dirs
imageadd: platform internal corners
/:cl:

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code/game/objects/structures/platforms.dm

@@ -17,6 +17,15 @@
 			COMSIG_ATOM_EXIT = PROC_REF(on_exit),
 		)
 		AddElement(/datum/element/connect_loc, loc_connections)
+	update_appearance()
+
+/obj/structure/platform/update_appearance(updates)
+	. = ..()
+	if(dir == 1)
+		layer = 2.89
+	else
+		layer = 3.08
+
 
 /obj/structure/platform/corner
 	icon_state = "platform_corners"

code/game/objects/structures/railings.dm

@@ -106,16 +106,16 @@
 	if(!(direction & dir))
 		return
 
-	if (!density)
+	if(!density)
 		return
 
-	if (leaving.throwing)
+	if(leaving.throwing)
 		return
 
-	if (leaving.movement_type & (PHASING | FLYING | FLOATING))
+	if(leaving.movement_type & (PHASING | FLYING | FLOATING))
 		return
 
-	if (leaving.move_force >= MOVE_FORCE_EXTREMELY_STRONG)
+	if(leaving.move_force >= MOVE_FORCE_EXTREMELY_STRONG)
 		return
 
 	leaving.Bump(src)
@@ -196,3 +196,9 @@
 	density = FALSE
 	climbable = FALSE
 	buildstackamount = 1
+
+/obj/structure/railing/thick
+	icon_state = "railing_thick"
+
+/obj/structure/railing/thick/corner
+	icon_state = "railing_thick_corner"