Support "mirrors" array in the config file for link sharing

For issue #642

src/components/Profile.vue

@@ -65,7 +65,7 @@
       </v-row>
     </v-container>
 
-    <copy-link :locationLink="directMessageLink" >
+    <copy-link :locationLink="directMessageLink" :allowMirrors="true" @mirror-change="(mirror) => currentMirror = mirror">
       <v-card-title class="h2">{{ $t("room_info.direct_link") }}</v-card-title>
       <v-card-text>{{ $t("room_info.direct_link_desc") }}</v-card-text>
     </copy-link>
@@ -297,7 +297,8 @@ export default {
       isAvatarLoaded: true,
       loadValue: 0,
       newPasswordHasError: false,
-      notificationDialog: false
+      notificationDialog: false,
+      currentMirror: null
     };
   },
 
@@ -306,7 +307,7 @@ export default {
       return this.$matrix.currentUser.user_id
     },
     directMessageLink() {
-      return this.$router.getDMLink(this.$matrix.currentUser, this.$config);
+      return this.$router.getDMLink(this.$matrix.currentUser, this.$config, this.currentMirror);
     },
     passwordsMatch() {
       return (
@@ -425,6 +426,7 @@ export default {
     if(this.globalNotification && this.windowNotificationPermission() !== 'granted') {
       this.onUpdateGlobalNotification(false);
     }
+    this.currentMirror = null;
   }
 };
 </script>