Access rank: nobody

Features in config.ini can now be disabled even for admins
(makes privilege testing easy on admin accounts)

src/Models/AccessRank.php

@@ -6,4 +6,5 @@ class AccessRank extends Enum
 	const PowerUser = 2;
 	const Moderator = 3;
 	const Admin = 4;
+	const Nobody = 5;
 }