Add a dropdown on participate menu, disallow listing participations

Now requires quering the person endpoint to know if an actor
participates in an event, organizers can make authenticated requests to
event { participants { } } to see the pending / approved participants.

Also closes #174

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

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

@@ -1,5 +1,5 @@
 import { ICurrentUser } from '@/types/current-user.model';
-import { IEvent } from '@/types/event.model';
+import { IEvent, IParticipant } from '@/types/event.model';
 import { Actor, IActor } from '@/types/actor/actor.model';
 
 export interface IFeedToken {
@@ -11,11 +11,13 @@ export interface IFeedToken {
 export interface IPerson extends IActor {
   feedTokens: IFeedToken[];
   goingToEvents: IEvent[];
+  participations: IParticipant[];
 }
 
 export class Person extends Actor implements IPerson {
   feedTokens: IFeedToken[] = [];
   goingToEvents: IEvent[] = [];
+  participations: IParticipant[] = [];
 
   constructor(hash: IPerson | {} = {}) {
     super(hash);