Saving & restoring video watching progress

Video progress updates:

- Mark as 'done' when 90% or more is watched.
- Keep 'done' flag when re-watching.

The video progress is stored on three events, whichever comes first:

- Every 30 seconds of video.
- Every 10% of the video.
- Every pause/stop/navigation to another page.
- When we detect the video is looping.

src/templates/nodes/custom/asset/video/view_embed.pug

@@ -67,6 +67,14 @@ script(type="text/javascript").
 		});
 		this.hotkeys();
 
+		{% if current_user.is_authenticated %}
+		let fetch_progress_url = '{{ url_for("users_api.get_video_progress", video_id=node._id) }}';
+		let report_url = '{{ url_for("users_api.set_video_progress", video_id=node._id) }}';
+		this.progressPlugin({
+			'report_url': report_url,
+			'fetch_progress_url': fetch_progress_url,
+		});
+		{% endif %}
 	});
 
 	function addVideoPlayerButton(data) {