Allow to join an open group

Also:

* Refactor interacting with a remote event so that you can interact with
  a remote group as well
* Add a setting for group admins to pick between an open and invite-only
  group
* Fix new groups without posts/todos/resources/events/conversations URL
  set
* Repair local groups that haven't got their
  posts/todos/resources/events/conversations URL set
* Add a scheduled job to refresh remote groups every hour
* Add a user setting to pick when to receive notifications when there's
  new members to approve (will be used when this feature is available)
* Fix pagination for members

Signed-off-by: Thomas Citharel <tcit@tcit.fr>

js/src/graphql/user.ts

@@ -119,6 +119,7 @@ export const USER_SETTINGS_FRAGMENT = gql`
     notificationEachWeek
     notificationBeforeEvent
     notificationPendingParticipation
+    notificationPendingMembership
   }
 `;
 
@@ -141,7 +142,8 @@ export const SET_USER_SETTINGS = gql`
     $notificationOnDay: Boolean
     $notificationEachWeek: Boolean
     $notificationBeforeEvent: Boolean
-    $notificationPendingParticipation: NotificationPendingParticipationEnum
+    $notificationPendingParticipation: NotificationPendingEnum
+    $notificationPendingMembership: NotificationPendingEnum
   ) {
     setUserSettings(
       timezone: $timezone
@@ -149,6 +151,7 @@ export const SET_USER_SETTINGS = gql`
       notificationEachWeek: $notificationEachWeek
       notificationBeforeEvent: $notificationBeforeEvent
       notificationPendingParticipation: $notificationPendingParticipation
+      notificationPendingMembership: $notificationPendingMembership
     ) {
       ...UserSettingFragment
     }