Add a feature where recent public channel messages can be echoed back to
newly joining users when they enter the chat room.
* Configure in settings.toml with EchoMessagesOnJoin. 0 = disable storage.
* Messages are stored in RAM and lost on a server reboot.
* A buffer of recent public messages per channel can be kept, e.g. for the
10 most recent messages.
* The settings can be reloaded with /reconfigure and the message buffers
will rebalance on the next message sent.
* When a new user logs in, a new "echo" message is sent that contains all
of the echoed messages on a "messages" list, in one WebSocket packet.
* Echoed messages are put above the ChatServer welcome messages.
* If a message is taken back, it's removed from the echo message buffer.
Other Changes
* Don't broadcast Presence messages within 30 seconds of the server boot, to
lessen a flood of messages when a lot of users were connected at reboot.
* Change the default "Join messages" setting on front-end to hide them in
public channels.
* For the admin buttons in ProfileModal, use the AlertModal instead of native
browser prompts.
Add moderation rules:
* You can apply rules in the settings.toml to enforce moderator restrictions on
certain users, e.g. to force their camera to always be NSFW or bar them from
sharing their webcam at all anymore.
Chat UI improvements around users blocking admin accounts:
* When a main website block is in place, the DMs button in the Who List shows
as greyed out with a cross through, as if that user had closed their DMs.
* Admin users are always able to watch the camera of people who have blocked
them. The broadcaster is not notified about the watch.
New operator commands:
* /cut username: to tell a user to turn off their webcam.
* /unmute-all: to lift all mutes on your side, e.g. so your moderator chatbot
can still see public messages from users who have blocked it.
* /help-advanced: moved the more dangerous admin command documentation here.
Miscellaneous fixes:
* The admin commands now tolerate an @ prefix in front of usernames.
* The /nsfw command won't fire unless the user's camera is actually active and
not marked as explicit.
* New API endpoint: /api/blocklist where your site can pre-deliver muted
username lists for users before they enter the chat.
* Image sharing in DMs is allowed if either party is an operator.
* Consolidate all the Video flags (active, nsfw, mutual, mutualOpen)
into a bitmask flag (single integer)
* New video flag for when the source has muted their video, to show a
crossed out grey mic on their camera for other chatters
* Bugfixes around syncing the mute state for self and other videos when
videos are opened, closed and opened again
* Profile pictures on the DMs list
