Previously, ending a read stream was `stream.push(null)`, and ending a
write stream was `stream.end()`. This was often confusing, and so now,
these are consistently `stream.pushEnd()` and `stream.writeEnd()`.
This refactor already found a bug in which `stream.end()` was used
where `stream.push(null)` should have been.
Also in this refactor: By default, `pushError` ends the stream. You can
pass `true` as the second parameter if the error is recoverable (the
stream shouldn't end).
`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
When I originally wrote the Streams library, TypeScript-in-JS didn't
support generics. But now the library can have significantly nicer
typing, and so it now does.
