* Add a History button under the DMs where an authenticated JWT user can page
through the usernames they have stored history with, to bring up those DMs
even if their chat partner is not currently online.
* Try some fixes to the dark video detector to see if it reduces false
positives: wait for the canplaythrough video event to fire before beginning
the dark detection. Also, increase the threshold so dark frames need to be
seen 5 times in a row instead of twice before cutting the camera.
* Add support for storing DM history between users in a SQLite3 database.
* Opt-in by editing your settings.toml to set DirectMessageHistory/Enabled=true
* Retention days (default 90) will flush old DMs on app startup.
* On the front-end, DM history is checked when a DM thread is opened.
* Deadlock detection: the chatbot handlers will spin off a background goroutine
to ping DMs at itself and test for responsiveness. If the echoes don't return
for a minute, issue a /api/shutdown command to the HTTP server to force a
reboot.
* New admin API endpoint: /api/shutdown, equivalent to the operator '/shutdown'
command sent in chat. Requires your AdminAPIKey to call it. Used by the chatbot
as part of deadlock detection.
* Adjust some uses of mutexes to hopefully mitigate deadlocks a bit.
* Do Not Disturb: if users opt to "Ignore unsolicited DMs" they will set a DND
status on the server which will grey-out their DM icon for other chatters.
* Bring back an option for ChatServer to notify you when somebody begins watching
your camera (on by default).
* Automatically focus the message entry box when changing channels.
* Lower webcam resolution hints to 480p to test performance implications.
