Add identity pickers on event creation & join

Also it now saves current actor in localStorage and initalizes it in
Apollo Cache (just like user stuff). This allows not relying on
loggedPerson query anymore.

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

js/src/types/actor/actor.model.ts

@@ -36,7 +36,7 @@ export class Actor implements IActor {
     return `@${this.preferredUsername}${domain}`;
   }
 
-  displayName(): string {
+  public displayName(): string {
     return this.name != null && this.name !== '' ? this.name : this.usernameWithDomain();
   }
 }

js/src/types/event.model.ts

@@ -90,7 +90,7 @@ export interface IEvent {
 
   picture: IPicture | null;
 
-  organizerActor: IActor;
+  organizerActor?: IActor;
   attributedTo: IActor;
   participants: IParticipant[];
 
@@ -159,7 +159,7 @@ export class EventModel implements IEvent {
   relatedEvents: IEvent[] = [];
 
   attributedTo = new Actor();
-  organizerActor = new Actor();
+  organizerActor?: IActor;
 
   tags: ITag[] = [];
   options: IEventOptions = new EventOptions();