Porting updates related to material datums. (#12317)

* Porting updates related to material datums.

* art_type

* oh oh

code/modules/clothing/masks/gasmask.dm

@@ -198,6 +198,7 @@
 	desc = "A creepy wooden mask. Surprisingly expressive for a poorly carved bit of wood."
 	icon_state = "tiki_eyebrow"
 	item_state = "tiki_eyebrow"
+	custom_materials = list(/datum/material/wood = MINERAL_MATERIAL_AMOUNT * 1.25)
 	resistance_flags = FLAMMABLE
 	max_integrity = 100
 	actions_types = list(/datum/action/item_action/adjust)

code/modules/clothing/shoes/miscellaneous.dm

@@ -45,6 +45,7 @@
 	desc = "A pair of rather plain wooden sandals."
 	name = "sandals"
 	icon_state = "wizard"
+	custom_materials = list(/datum/material/wood = MINERAL_MATERIAL_AMOUNT * 0.5)
 	strip_delay = 50
 	equip_delay_other = 50
 	permeability_coefficient = 0.9