Adding Hijab's, a variant of the robe, and alien ninja-suits (#1738)

Just adding contained sprites and code for Hijab's and a differently sprited and described variant of the robe Jackboot really liked a while back.

Hijabs (probably) came from Bay, thanks to Alberyk for handing off the robe sprites months ago.

Nanako told me it'd be a good idea to put both the variant and the original robe sprites into their own contained sprites, but I'd probably need to mess with custom-loadout for that and Alberyk already has a PR for that, so, yeah.

EDIT:Also alien ninja suit sprites, yay.

code/modules/client/preference_setup/loadout/loadout_head.dm

@@ -111,3 +111,19 @@
 /datum/gear/head/ushanka
 	display_name = "ushanka"
 	path = /obj/item/clothing/head/ushanka
+
+/datum/gear/head/hijab
+	display_name = "hijab selection"
+	path = /obj/item/clothing/head/hijab
+
+/datum/gear/head/hijab/New()
+	..()
+	var/hijab = list()
+	hijab["black hijab"] = /obj/item/clothing/head/hijab
+	hijab["grey hijab"] = /obj/item/clothing/head/hijab/grey
+	hijab["red hijab"] = /obj/item/clothing/head/hijab/red
+	hijab["brown hijab"] = /obj/item/clothing/head/hijab/brown
+	hijab["green hijab"] = /obj/item/clothing/head/hijab/green
+	hijab["blue hijab"] = /obj/item/clothing/head/hijab/blue
+
+	gear_tweaks += new/datum/gear_tweak/path(hijab)

code/modules/client/preference_setup/loadout/loadout_xeno.dm

@@ -14,6 +14,13 @@
 	whitelisted = "Unathi"
 	sort_category = "Xenowear"
 
+/datum/gear/suit/robe_coat
+	display_name = "tzirzi robe (Unathi)"
+	path = /obj/item/clothing/suit/unathi/robe/robe_coat
+	cost = 1
+	whitelisted = "Unathi"
+	sort_category = "Xenowear"
+
 //skrell headtail adorns
 
 /datum/gear/ears/f_skrell
@@ -67,7 +74,7 @@
 	cost = 1
 	whitelisted = "Vaurca"
 	sort_category = "Xenowear"
-	
+
 /datum/gear/cape
 	display_name = "tunnel cloak (Vaurca)"
 	path = /obj/item/weapon/storage/backpack/cloak