Replaces /atom.initialized and .admin_spawned with flags (#37981)

kill .initialized and .admin_spawned from /atom

code/modules/admin/admin.dm

@@ -643,7 +643,7 @@
 		T.ChangeTurf(chosen)
 	else
 		var/atom/A = new chosen(usr.loc)
-		A.admin_spawned = TRUE
+		A.flags_1 |= ADMIN_SPAWNED_1
 
 	log_admin("[key_name(usr)] spawned [chosen] at ([usr.x],[usr.y],[usr.z])")
 	SSblackbox.record_feedback("tally", "admin_verb", 1, "Spawn Atom") //If you are copy-pasting this, ensure the 2nd parameter is unique to the new proc!

code/modules/admin/topic.dm

@@ -2059,7 +2059,7 @@
 					else
 						var/atom/O = new path(target)
 						if(O)
-							O.admin_spawned = TRUE
+							O.flags_1 |= ADMIN_SPAWNED_1
 							O.setDir(obj_dir)
 							if(obj_name)
 								O.name = obj_name