Fixes#26211
Admin messages now have separate "seen" and "dismissed" fields. The idea is that an admin should be able to tell whether a user pressed the "dismiss for now" button. Instead of using "seen" as "show this message to players when they join", "dismissed" is now used for this.
Existing notes in the database will automatically be marked as dismissed on migration. A note cannot be dismissed without being seen (enforced via constraint in the database too, aren't I fancy).
As part of this, it has become impossible for a player to play without dismissing the message in some form. Instead of a shitty popup window, the popup is now a fullscreen overlay that blocks clicks behind it, making the game unplayable. Also, if a user somehow has multiple messages they will be combined into one popup.
Also I had enough respect for the codebase to make it look better and clean up the code somewhat. Yippee.
* Use new Subs.CVar helper
Removes manual config OnValueChanged calls, removes need to remember to manually unsubscribe.
This both reduces boilerplate and fixes many issues where subscriptions weren't removed on entity system shutdown.
* Fix a bunch of warnings
* More warning fixes
* Use new DateTime serializer to get rid of ISerializationHooks in changelog code.
* Get rid of some more ISerializationHooks for enums
* And a little more
* Apply suggestions from code review
Co-authored-by: 0x6273 <0x40@keemail.me>
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Co-authored-by: 0x6273 <0x40@keemail.me>
