[DELEGATION] Edit attendance and events, delete event for someone (#553)

* [#523] added way to manage attendance for delegated calendars

* [DELEGATION] #523 & #524 changed eventURL calculation for delegated events to have the rigth one

* [#524] added drag and drop authorisation to delegated event

* [#524] added tests

* [#524] support for the permission access

* [#524] no edit when delegated event is not public

__test__/features/Calendars/services/refreshCalendar.test.tsx

@@ -17,8 +17,7 @@ describe("refreshCalendarWithSyncToken", () => {
     id: "user1/cal1",
     name: "Test Calendar",
     link: "/calendars/user1/cal1.json",
-    owner: "Test User",
-    ownerEmails: ["test@example.com"],
+    owner: { firstname: "Test User", emails: ["test@example.com"] },
     description: "Test calendar description",
     delegated: false,
     color: { light: "#006BD8", dark: "#FFF" },