makes the rcd able to make girders (#76515)

## About The Pull Request

rcd can make girders at half the cost of making a wall in 1.3 seconds

## Why It's Good For The Game
more "rapid" than using iron for girders and putting whatever material
on it

## Changelog
🆑
add: rcd can make girders now
/🆑

code/__DEFINES/construction.dm

@@ -188,6 +188,7 @@ GLOBAL_LIST_INIT(crafting_category, list(
 #define RCD_FLOODLIGHT 8
 #define RCD_WALLFRAME 9
 #define RCD_REFLECTOR 10
+#define RCD_GIRDER 11
 
 
 #define RCD_UPGRADE_FRAMES (1<<0)

code/game/objects/items/rcd/RCD.dm

@@ -48,6 +48,7 @@
 				list(CONSTRUCTION_MODE = RCD_WINDOWGRILLE, WINDOW_TYPE = /obj/structure/window/reinforced/fulltile, ICON = "rwindow0", TITLE = "Full Tile Reinforced Window"),
 				list(CONSTRUCTION_MODE = RCD_CATWALK, ICON = "catwalk-0", TITLE = "Catwalk"),
 				list(CONSTRUCTION_MODE = RCD_REFLECTOR, ICON = "reflector_base", TITLE = "Reflector"),
+				list(CONSTRUCTION_MODE = RCD_GIRDER, ICON = "girder", TITLE = "Girder"),
 			),
 
 			//Computers & Machine Frames

code/game/turfs/open/floor.dm

@@ -232,6 +232,8 @@
 			return list("mode" = RCD_COMPUTER, "delay" = 20, "cost" = 25)
 		if(RCD_FLOODLIGHT)
 			return list("mode" = RCD_FLOODLIGHT, "delay" = 30, "cost" = 35)
+		if(RCD_GIRDER)
+			return list("mode" = RCD_GIRDER, "delay" = 1.3 SECONDS, "cost" = 8)
 		if(RCD_FURNISHING)
 			var/cost = 0
 			var/delay = 0
@@ -365,6 +367,11 @@
 			new_floodlight.icon_state = "floodlight_c3"
 			new_floodlight.state = FLOODLIGHT_NEEDS_LIGHTS
 			return TRUE
+		if(RCD_GIRDER)
+			if(locate(/obj/structure/girder) in src)
+				return FALSE
+			new /obj/structure/girder(src)
+			return TRUE
 		if(RCD_FURNISHING)
 			if(locate(the_rcd.furnish_type) in src)
 				return FALSE

code/game/turfs/open/misc.dm

@@ -101,6 +101,8 @@
 			return list("mode" = RCD_COMPUTER, "delay" = 20, "cost" = 25)
 		if(RCD_FLOODLIGHT)
 			return list("mode" = RCD_FLOODLIGHT, "delay" = 30, "cost" = 35)
+		if(RCD_GIRDER)
+			return list("mode" = RCD_GIRDER, "delay" = 1.3 SECONDS, "cost" = 8)
 		if(RCD_FURNISHING)
 			var/cost = 0
 			var/delay = 0
@@ -222,6 +224,11 @@
 			new_floodlight.icon_state = "floodlight_c3"
 			new_floodlight.state = FLOODLIGHT_NEEDS_LIGHTS
 			return TRUE
+		if(RCD_GIRDER)
+			if(locate(/obj/structure/girder) in src)
+				return FALSE
+			new /obj/structure/girder(src)
+			return TRUE
 		if(RCD_FURNISHING)
 			if(locate(the_rcd.furnish_type) in src)
 				return FALSE

code/modules/asset_cache/assets/rcd.dm

@@ -15,7 +15,7 @@
 		'icons/obj/objects.dmi' = list("bed"),
 		'icons/obj/smooth_structures/catwalk.dmi' = list("catwalk-0"),
 		'icons/hud/radial.dmi' = list("cnorth", "csouth", "ceast", "cwest", "chair", "secure_windoor", "stool", "wallfloor", "windowsize", "windowtype", "windoor"),
-		'icons/obj/structures.dmi' = list("glass_table", "rack", "rwindow0", "reflector_base", "table", "window0"),
+		'icons/obj/structures.dmi' = list("glass_table", "rack", "rwindow0", "reflector_base", "table", "window0", "girder"),
 	)
 
 	var/icon/icon