* feat(visitors): Visitors chat.
Only live chat is supported, no room history is loaded on visitor nodes.
* feat(visitors): Append display name to promotion requests.
* feat: Indicate visitor's chat messages.
* fix: Fixes preconfigure vnodes script.
* fix: Fixes few cases around routing messages.
Disables private messaging on visitor node and add anonymous name to those visitors without a pre-set name.
* fix: Fixes grouping visitor's messages and some error translations.
* squash: Fixes main.json.
