URL scheme to update current config.

Motivation: i have a script that changes the configuration. When that happens, the app detects the change and ask the user to update. This would allow to programatically tell ClashX to update the config without user intervention

ClashX/AppDelegate.swift

@@ -931,6 +931,8 @@ extension AppDelegate {
             DispatchQueue.main.asyncAfter(deadline: .now() + 0.2) {
                 NotificationCenter.default.post(name: Notification.Name(rawValue: "didGetUrl"), object: nil, userInfo: userInfo)
             }
+        } else if host == "update-config" {
+          updateConfig()
         }
     }
 }