`server/chat-commands.js` is now a directory. It's been split into
`core`, `moderation`, and `admin`. `info` and `roomsettings` from
`chat-plugins` have also moved to `chat-commands`.
Some cleanup:
- Bot commands for inserting HTML into rooms like `/adduhtml` have been
moved from `info` into `admin`.
- `/a` has been renamed `/addline`, for clarity (and also moved from
`info` into `admin`).
- Room management commands like `/createroom` and `/roomintro` were
moved to `room-settings`
- `chat-commands/admin` has been TypeScripted
