predefined report reasons & improved reporter UI (#2842)

- added `startAt` and `endAt` optional timestamps to help pin down reported sections of a video
- added predefined report reasons
- added video player with report modal

shared/models/activitypub/objects/common-objects.ts

@@ -1,3 +1,5 @@
+import { VideoAbusePredefinedReasonsString } from '@shared/models/videos'
+
 export interface ActivityIdentifierObject {
   identifier: string
   name: string
@@ -70,17 +72,22 @@ export type ActivityHtmlUrlObject = {
 }
 
 export interface ActivityHashTagObject {
-  type: 'Hashtag' | 'Mention'
+  type: 'Hashtag'
   href?: string
   name: string
 }
 
 export interface ActivityMentionObject {
-  type: 'Hashtag' | 'Mention'
+  type: 'Mention'
   href?: string
   name: string
 }
 
+export interface ActivityFlagReasonObject {
+  type: 'Hashtag'
+  name: VideoAbusePredefinedReasonsString
+}
+
 export type ActivityTagObject =
   ActivityPlaylistSegmentHashesObject
   | ActivityPlaylistInfohashesObject