Remove `alluserids` and similar lists from the signaling messages

[nickvergessen]

How to use GitHub

• Please use the 👍 reaction to show that you are affected by the same issue.
• Please don't comment if you have no relevant information to add. It's just extra noise for everyone subscribed to this issue.
• Subscribe to receive notifications on status change and new comments.

---

• After confirmation by @fancycode we should remove the "preventing to scale" attributes from signaling messages
• The HPB should simply relay the message to all connected clients instead
• The server can stop generating the list, if the HPB has a tbd feature capability

[fancycode]

The alluserids list is currently used so the signaling server knows which users to notify about changes in rooms (property changes, invites, disinvites, etc.). This especially is required for users not currently in the affected room (which the signaling server would know about), but for users that are not in the room and have it in the room list.

These users should update the room list according to the changes of such rooms.

Ideas:

• query the rooms a user is in during initial connection (might be expensive for users with lots of rooms)
• only notify users that are in the affected room
• remove the events completely and have clients refresh their whole list regularly