Split up and rename var/flags (#17794)

* Split up and rename `var/flags`

* Various fixes

* CL

* Don't rename Phoron Guard phoron preset

---------

Co-authored-by: Cody Brittain <cbrittain10@live.com>

code/modules/reagents/reagent_containers/tooth_paste.dm

@@ -3,7 +3,7 @@
 	desc = "A simple tube full of toothpaste."
 	icon = 'icons/obj/chemical.dmi'
 	icon_state = "toothpaste"
-	flags = OPENCONTAINER
+	atom_flags = ATOM_FLAG_OPEN_CONTAINER
 	possible_transfer_amounts = null
 	amount_per_transfer_from_this = 5
 	volume = 20
@@ -27,7 +27,7 @@
 	desc = "An essential tool in dental hygiene."
 	icon = 'icons/obj/chemical.dmi'
 	icon_state = "toothbrush_b"
-	flags = OPENCONTAINER
+	atom_flags = ATOM_FLAG_OPEN_CONTAINER
 	possible_transfer_amounts = null
 	amount_per_transfer_from_this = 5
 	volume = 5
@@ -68,7 +68,7 @@
 			if(!reagents.total_volume)
 				to_chat(user, "<span class='warning'>The [initial(name)] is dry!</span>")
 			else if(reagents.total_volume)
-				if(user.zone_sel.selecting == BP_MOUTH && !(M.wear_mask && M.wear_mask.item_flags & AIRTIGHT))
+				if(user.zone_sel.selecting == BP_MOUTH && !(M.wear_mask && M.wear_mask.item_flags & ITEM_FLAG_AIRTIGHT))
 					user.do_attack_animation(src)
 					user.visible_message("<span class='warning'>[user] is trying to brush \the [target]'s teeth \the [src]!</span>")
 					playsound(loc, 'sound/effects/toothbrush.ogg', 15, 1)