This implements two big changes:
- All settings shared between `room.chatRoomData` and `room` have been
merged into `room.settings` (so, for instance, `room.slowchat` is now
only `room.settings.slowchat`).
This makes it so we never have to worry about them getting "out of
sync".
- Checking to see if a room is persistent is now `if (room.persist)`
instead of `if (room.chatRoomData)`
- `Rooms.global.writeChatRoomData()` is now rarely called directly;
there's a new `room.saveSettings()` which will handle it for you.
- All properties of `room.settings` are now optional (except
`title`).
- There's a new file `user-groups.ts` which handles authority.
- `room.auth` and `Users.globalAuth` are now
`Auth extends Map<ID, GroupSymbol>` objects.
- `room.auth` is now always defined, removing the need for
`room.auth?.[userid]` workarounds.
- A lot of code relating to usergroups and permission checks have
been refactored.
Co-authored-by: Guangcong Luo <guangcongluo@gmail.com>
