Regular ReadStreams still can't; I now believe they shouldn't have a
"default" read method, and you should explicitly choose whether you
want to read "by chunks as they become available", "by chunks of a
specific line" or "by a delimiter".
So you would specifically use `stream.byLine()` or
`stream.byChunk([size])`, which would return an
`ObjectReadStream<string>`.
Inspired by #7195
Battle protocol documentation, instead of being strewn between
`PROTOCOL.md` and `sim/README.md`, is now in `sim/SIM-PROTOCOL.md`.
Also added:
- documentation for how to do searches and challenges
- documentation for packed team format
Fixes#5005
