Refactor dependencies to reduce code base size (#111)

Use crates to reduce code base size :

* `actix-remote-ip` to safely determine user IP location
* `light-openid` for the OpenID primitives & as client to handle federation

Reviewed-on: #111

src/controllers/login_controller.rs

@@ -1,5 +1,6 @@
 use actix::Addr;
 use actix_identity::Identity;
+use actix_remote_ip::RemoteIP;
 use actix_web::{web, HttpRequest, HttpResponse, Responder};
 use askama::Template;
 use std::sync::Arc;
@@ -14,7 +15,6 @@ use crate::controllers::base_controller::{
 use crate::data::action_logger::{Action, ActionLogger};
 use crate::data::login_redirect::LoginRedirect;
 use crate::data::provider::{Provider, ProvidersManager};
-use crate::data::remote_ip::RemoteIP;
 use crate::data::session_identity::{SessionIdentity, SessionStatus};
 use crate::data::user::User;
 use crate::data::webauthn_manager::WebAuthManagerReq;