* remove old Peertube 3.0.1 hook compatibility
* use new parameters for hook action:video-watch.video.loaded (Peertube
3.2.0)
* backward compatibility with Peertube 3.1.0 hooks
* don't display webchat if there is a current playlist
* init some shared functions (videoHasWebchat, parseConfigUUIDs)
* api/room: checking that video has live enabled
* fix promise handling in initChat function
* removing some 'use strict' that are no more necessary in typescript