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/ParticipationButton.vue

@@ -142,7 +142,8 @@ A button to set your participation
 
 <script lang="ts">
 import { Component, Prop, Vue } from "vue-property-decorator";
-import { EventJoinOptions, IEvent, IParticipant, ParticipantRole } from "../../types/event.model";
+import { IParticipant, ParticipantRole } from "../../types/participant.model";
+import { EventJoinOptions, IEvent } from "../../types/event.model";
 import { IPerson, Person } from "../../types/actor";
 import { CURRENT_ACTOR_CLIENT, IDENTITIES } from "../../graphql/actor";
 import { CURRENT_USER_CLIENT } from "../../graphql/user";
@@ -182,20 +183,20 @@ export default class ParticipationButton extends Vue {
 
   RouteName = RouteName;
 
-  joinEvent(actor: IPerson) {
+  joinEvent(actor: IPerson): void {
     if (this.event.joinOptions === EventJoinOptions.RESTRICTED) {
-      this.$emit("joinEventWithConfirmation", actor);
+      this.$emit("join-event-with-confirmation", actor);
     } else {
-      this.$emit("joinEvent", actor);
+      this.$emit("join-event", actor);
     }
   }
 
-  joinModal() {
-    this.$emit("joinModal");
+  joinModal(): void {
+    this.$emit("join-modal");
   }
 
-  confirmLeave() {
-    this.$emit("confirmLeave");
+  confirmLeave(): void {
+    this.$emit("confirm-leave");
   }
 
   get hasAnonymousParticipationMethods(): boolean {