Split up and rename var/flags (#17794)

* Split up and rename `var/flags`

* Various fixes

* CL

* Don't rename Phoron Guard phoron preset

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

code/modules/paperwork/pen.dm

@@ -168,7 +168,7 @@
  * Reagent Pens
  */
 /obj/item/pen/reagent
-	flags = OPENCONTAINER
+	atom_flags = ATOM_FLAG_OPEN_CONTAINER
 	slot_flags = SLOT_BELT
 	origin_tech = list(TECH_MATERIAL = 2, TECH_ILLEGAL = 5)
 

code/modules/paperwork/photography.dm

@@ -134,7 +134,7 @@ var/global/photo_count = 0
 	icon_state = "camera"
 	item_state = "electropack"
 	w_class = ITEMSIZE_SMALL
-	flags = CONDUCT
+	obj_flags = OBJ_FLAG_CONDUCTABLE
 	slot_flags = SLOT_BELT
 	matter = list(DEFAULT_WALL_MATERIAL = 2000)
 	var/pictures_max = 10