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/providers_controller.rs

@@ -2,6 +2,7 @@ use std::sync::Arc;
 
 use actix::Addr;
 use actix_identity::Identity;
+use actix_remote_ip::RemoteIP;
 use actix_web::{web, HttpRequest, HttpResponse, Responder};
 use askama::Template;
 
@@ -16,7 +17,6 @@ use crate::data::action_logger::{Action, ActionLogger};
 use crate::data::login_redirect::LoginRedirect;
 use crate::data::provider::{ProviderID, ProvidersManager};
 use crate::data::provider_configuration::ProviderConfigurationHelper;
-use crate::data::remote_ip::RemoteIP;
 use crate::data::session_identity::{SessionIdentity, SessionStatus};
 
 #[derive(askama::Template)]