New option to only allow registered users to speak WIP (#233):

* Prosody mod_muc_peertubelivechat_roles module
* Fix ConverseJS to disable the message field when room is unmoderated
  and user is visitor
* Mute/voice anonymous users when changing room configuration.
* Display a specific message to muted anonymous users.
* Default value for mute_anonymous in channel options.
* Feature documentation

shared/lib/types.ts

@@ -101,6 +101,11 @@ interface ChannelConfigurationOptions {
   slowMode: {
     duration: number
   }
+  mute: {
+    anonymous: boolean
+    // TODO: https://github.com/JohnXLivingston/peertube-plugin-livechat/issues/127
+    // nonFollowers: boolean (or a number of seconds?)
+  }
 }
 
 interface ChannelForbiddenWords {