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/components/Event/EventMinimalistCard.vue

@@ -56,6 +56,7 @@
 import { Component, Prop, Vue } from "vue-property-decorator";
 import { IEvent } from "@/types/event.model";
 import DateCalendarIcon from "@/components/Event/DateCalendarIcon.vue";
+import { ParticipantRole } from "../../types/participant.model";
 import RouteName from "../../router/name";
 
 @Component({
@@ -67,6 +68,8 @@ export default class EventMinimalistCard extends Vue {
   @Prop({ required: true, type: Object }) event!: IEvent;
 
   RouteName = RouteName;
+
+  ParticipantRole = ParticipantRole;
 }
 </script>
 <style lang="scss" scoped>