Change config to thread-safe system, needed for a future config panel.

Improved some two factor methods.

src/util.rs

@@ -2,8 +2,8 @@
 // Web Headers and caching
 //
 use rocket::fairing::{Fairing, Info, Kind};
-use rocket::{Request, Response};
 use rocket::response::{self, Responder};
+use rocket::{Request, Response};
 
 pub struct AppHeaders();