replaces atom.initialized with ATOM_INITIALIZED

refactors atom/var/flags to atom_flags and area_flags
moves NOBLOODY, NOBLUDGEON, and PHORONGUARD to item_flags instead of atom_flags
corrects various misapplied flags

code/modules/materials/sheets/_sheets.dm

@@ -41,7 +41,7 @@
 		color = material.icon_colour
 
 	if(!material.conductive)
-		flags |= NOCONDUCT
+		atom_flags |= NOCONDUCT
 
 	matter = material.get_matter()
 	update_strings()

code/modules/materials/sheets/supermatter.dm

@@ -29,7 +29,7 @@
 	if(istype(M, /mob/living/carbon/human))
 		var/mob/living/carbon/human/H = user
 		var/obj/item/clothing/gloves/G = H.gloves
-		if(istype(G) && ((G.flags & THICKMATERIAL && prob(70)) || istype(G, /obj/item/clothing/gloves/gauntlets)))
+		if(istype(G) && ((G.item_flags & THICKMATERIAL && prob(70)) || istype(G, /obj/item/clothing/gloves/gauntlets)))
 			burn_user = FALSE
 
 		if(burn_user)
@@ -52,4 +52,4 @@
 		qdel(src)
 		return
 	SSradiation.radiate(get_turf(src), amount * 2)
-	..()
+	..()