Reworking Bot API and optimizing for loops in admin code (#6355)

code/modules/admin/admin_ranks.dm

@@ -61,10 +61,11 @@ var/list/admin_ranks = list()								//list of all ranks with associated rights
 /proc/load_admins()
 	//clear the datums references
 	admin_datums.Cut()
-	for(var/client/C in admins)
+	for(var/s in staff)
+		var/client/C = s
 		C.remove_admin_verbs()
 		C.holder = null
-	admins.Cut()
+	staff.Cut()
 
 	// Clears admins from the world config.
 	for (var/A in world.GetConfig("admin"))