Changing defaults MUC affiliation (#385):

* For Peertube moderators/admins, we add a button "Promote". Clicking on it will promote them as MUC owner.

CHANGELOG.md

@@ -8,7 +8,6 @@ TODO: tag custom ConverseJS, and update build-conversejs.sh.
 
 * #177: streamer's task/to-do lists: streamers, and their room's moderators, can handle task lists directly. This can be used to handle viewers questions, moderation actions, ... More info in the [tasks documentation](https://livingston.frama.io/peertube-plugin-livechat/fr/documentation/user/streamers/tasks/).
 * #385: new way of managing chat access rights. Now streamers are owner of their chat rooms. Peertube admins/moderators are not by default, so that their identities are not leaking. But they have a button to promote as chat room owner, if they need to take action. Please note that there is a migration script that will remove all Peertube admins/moderators affiliations (unless they are video/channel's owner). They can get this access back using the button.
-* #385: the slow mode duration on the channel option page is now a default value for new rooms. Streamers can change the value room per room in the room's configuration.
 
 ### Minor changes and fixes