Adds another combat technician helmet option (#8025)

# About the pull request
Adds another combat technician helmet option, visually it looks the same
as an m10 helmet but comes with an integrated welding visor.
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# Explain why it's good for the game
Some people (including me) don't like the way the CT helmet looks, this
PR adds another option for an helmet with an integrated welding visor so
you don't have to sacrifice your eye slot for welding googles because
the helmet looks bad.
# Testing Photographs and Procedure
<details>
<summary>Screenshots & Videos</summary>

Put screenshots and videos here with an empty line between the
screenshots and the `<details>` tags.

</details>


# Changelog
:cl:
add: Added another combat technician helmet option
/:cl:

code/game/machinery/vending/vendor_types/squad_prep/squad_engineer.dm

@@ -114,10 +114,14 @@ GLOBAL_LIST_INIT(cm_vending_gear_engi, list(
 
 GLOBAL_LIST_INIT(cm_vending_clothing_engi, list(
 		list("STANDARD EQUIPMENT (TAKE ALL)", 0, null, null, null),
-		list("Standard Marine Apparel", 0, list(/obj/item/clothing/under/marine/engineer, /obj/item/clothing/shoes/marine/knife, /obj/item/clothing/gloves/marine, /obj/item/device/radio/headset/almayer/marine, /obj/item/clothing/head/helmet/marine/tech), MARINE_CAN_BUY_UNIFORM, VENDOR_ITEM_MANDATORY),
+		list("Standard Marine Apparel", 0, list(/obj/item/clothing/under/marine/engineer, /obj/item/clothing/shoes/marine/knife, /obj/item/clothing/gloves/marine, /obj/item/device/radio/headset/almayer/marine), MARINE_CAN_BUY_UNIFORM, VENDOR_ITEM_MANDATORY),
 		list("MRE", 0, /obj/item/storage/box/MRE, MARINE_CAN_BUY_MRE, VENDOR_ITEM_MANDATORY),
 		list("Map", 0, /obj/item/map/current_map, MARINE_CAN_BUY_KIT, VENDOR_ITEM_MANDATORY),
 
+		list("HELMET (CHOOSE 1)", 0, null, null, null),
+		list("M10 technician helmet", 0, /obj/item/clothing/head/helmet/marine/tech, MARINE_CAN_BUY_HELMET, VENDOR_ITEM_REGULAR),
+		list("M10 welding helmet", 0, /obj/item/clothing/head/helmet/marine/welding, MARINE_CAN_BUY_HELMET, VENDOR_ITEM_REGULAR),
+
 		list("ARMOR (CHOOSE 1)", 0, null, null, null),
 		list("Light Armor", 0, /obj/item/clothing/suit/storage/marine/light, MARINE_CAN_BUY_ARMOR, VENDOR_ITEM_REGULAR),
 		list("Medium Armor", 0, /obj/item/clothing/suit/storage/marine/medium, MARINE_CAN_BUY_ARMOR, VENDOR_ITEM_RECOMMENDED),

code/modules/clothing/head/helmet.dm

@@ -735,6 +735,13 @@ GLOBAL_LIST_INIT(allowed_helmet_items, list(
 	specialty = "M10 technician"
 	built_in_visors = list(new /obj/item/device/helmet_visor, new /obj/item/device/helmet_visor/welding_visor)
 
+/obj/item/clothing/head/helmet/marine/welding
+	name = "\improper M10 welding helmet"
+	desc = "A modified M10 marine helmet, Features a toggleable welding screen for eye protection. Completely invisible while toggled off as opposed to the technician helmet."
+	specialty = "M10 welding"
+	built_in_visors = list(new /obj/item/device/helmet_visor, new /obj/item/device/helmet_visor/welding_visor)
+
+
 /obj/item/clothing/head/helmet/marine/grey
 	desc = "A standard M10 Pattern Helmet. This one has not had a camouflage pattern applied to it yet. There is a built-in camera on the right side."
 	icon = 'icons/obj/items/clothing/hats/hats_by_map/classic.dmi'