Fatten mode and vore fatness, Modular jumpsuit options

Ported Fatten vore mode
Ported vore fatness hide function which makes you appear fatter based on how fat the people you've vored are
Readded grey jumpsuits as an option in loadouts
Readded grey jumpsuits to ClothesMate
The helplessness prefs for clothes now ignore modular clothes as did the original modular grey jumpsuit

code/modules/vending/clothesmate.dm

@@ -8,6 +8,7 @@
 	products = list(/obj/item/clothing/head/that = 4,
 					/obj/item/clothing/head/fedora = 3,
 					//GS13 EDIT START
+					/obj/item/clothing/under/color/grey = 20,
 		            /obj/item/clothing/suit/jacket/letterman_gato = 5,
 					//GS13 EDIT END
 					/obj/item/clothing/head/beret = 3,

code/modules/vore/eating/belly_obj.dm

@@ -43,7 +43,7 @@
 	var/wet_loop = TRUE						// Does this belly have a slimy internal loop?
 
 	//I don't think we've ever altered these lists. making them static until someone actually overrides them somewhere.
-	var/tmp/static/list/digest_modes = list(DM_HOLD,DM_DIGEST,DM_HEAL,DM_NOISY,DM_ABSORB,DM_UNABSORB)	// Possible digest modes
+	var/tmp/static/list/digest_modes = list(DM_HOLD,DM_DIGEST,DM_HEAL,DM_NOISY,DM_ABSORB,DM_UNABSORB,DM_FATTEN)	// GS13 Edit- Added DM_FATTEN
 
 	var/tmp/mob/living/owner					// The mob whose belly this is.
 	var/tmp/digest_mode = DM_HOLD				// Current mode the belly is set to from digest_modes (+transform_modes if human)