* Add "currentTime" and "event" body params to view endpoint
* Merge watching and view endpoints
* Introduce WatchAction AP activity
* Add tables to store viewer information of local videos
* Add endpoints to fetch video views/viewers stats of local videos
* Refactor views/viewers handlers
* Support "views" and "viewers" counters for both VOD and live videos
Introduce viewers attribute for live videos
Count views for live videos
Reduce delay to see the viewer update for lives
Add ability to configure video views buffer interval and view ip
expiration
