Goggles are airtight

Adds some 'plain' goggles that are airtight, and as such protect your eyes from things like phoron. Also allows eyewear to protect you from phoron if it's airtight (and hiding your eyes). Added airtight flag to science goggles, welding goggles, and 'plain' goggles I added. Weldning goggles only protect your eyes when down, since it removes the covers eyes flag when up.

code/ZAS/Phoron.dm

@@ -103,19 +103,23 @@ obj/var/phoronproof = 0
 
 	//Burn eyes if exposed.
 	if(vsc.plc.EYE_BURNS && (species.breath_type != "phoron"))
-		if(!head)
+		var/burn_eyes = 1
-			if(!wear_mask)
+
-				burn_eyes()
+		//Check for protective glasses
-			else
+		if(glasses && (glasses.body_parts_covered & EYES) && (glasses.item_flags & AIRTIGHT))
-				if(!(wear_mask.body_parts_covered & EYES))
+			burn_eyes = 0
-					burn_eyes()
+
-		else
+		//Check for protective maskwear
-			if(!(head.body_parts_covered & EYES))
+		if(burn_eyes && wear_mask && (wear_mask.body_parts_covered & EYES) && (wear_mask.item_flags & AIRTIGHT))
-				if(!wear_mask)
+			burn_eyes = 0
-					burn_eyes()
+
-				else
+		//Check for protective helmets
-					if(!(wear_mask.body_parts_covered & EYES))
+		if(burn_eyes && head && (head.body_parts_covered & EYES) && (head.item_flags & AIRTIGHT))
-						burn_eyes()
+			burn_eyes = 0
+
+		//If we still need to, burn their eyes
+		if(burn_eyes)
+			burn_eyes()
 
 	//Genetic Corruption
 	if(vsc.plc.GENETIC_CORRUPTION && (species.breath_type != "phoron"))

code/modules/clothing/glasses/glasses.dm

@@ -89,11 +89,20 @@ BLIND     // can't see anything
 	item_state_slots = list(slot_r_hand_str = "glasses", slot_l_hand_str = "glasses")
 	toggleable = 1
 	action_button_name = "Toggle Goggles"
+	item_flags = AIRTIGHT
 
 /obj/item/clothing/glasses/science/New()
 	..()
 	overlay = global_hud.science
 
+/obj/item/clothing/glasses/goggles
+	name = "Goggles"
+	desc = "Just some plain old goggles."
+	icon_state = "plaingoggles"
+	item_state_slots = list(slot_r_hand_str = "glasses", slot_l_hand_str = "glasses")
+	item_flags = AIRTIGHT
+	body_parts_covered = EYES
+
 /obj/item/clothing/glasses/night
 	name = "Night Vision Goggles"
 	desc = "You can totally see in the dark now!"
@@ -200,6 +209,7 @@ BLIND     // can't see anything
 	item_state_slots = list(slot_r_hand_str = "welding-g", slot_l_hand_str = "welding-g")
 	action_button_name = "Flip Welding Goggles"
 	matter = list(DEFAULT_WALL_MATERIAL = 1500, "glass" = 1000)
+	item_flags = AIRTIGHT
 	var/up = 0
 
 /obj/item/clothing/glasses/welding/attack_self()