Ports "Refactors can_see_reagents"

code/__DEFINES/is_helpers.dm

@@ -222,6 +222,8 @@ GLOBAL_LIST_INIT(heavyfootmob, typecacheof(list(
 
 #define isorgan(A) (istype(A, /obj/item/organ))
 
+#define isclothing(A) (istype(A, /obj/item/clothing))
+
 GLOBAL_LIST_INIT(pointed_types, typecacheof(list(
 	/obj/item/pen,
 	/obj/item/screwdriver,

code/__DEFINES/obj_flags.dm

@@ -41,6 +41,7 @@
 #define VOICEBOX_TOGGLABLE 		(1<<6)	//The voicebox in this clothing can be toggled.
 #define VOICEBOX_DISABLED 		(1<<7)	//The voicebox is currently turned off.
 #define IGNORE_HAT_TOSS			(1<<8)	//Hats with negative effects when worn (i.e the tinfoil hat).
+#define SCAN_REAGENTS			(1<<9)	// Allows helmets and glasses to scan reagents.
 
 // Flags for the organ_flags var on /obj/item/organ