Add lines_any to BufRead (mirroring str)

[RalfJung]

Currently, both str and BufRead provide a function lines() to iterate over lines as separated by \n. str also provides lines_any() to recognize both \n and \r\n as line separator. This is very useful, e.g. to iterate over the lines of stdin and get the same behavior across platforms. Hence I think BufRead should have lines_any() as well.

I'm currently trying to implement this myself.

Note: I think it would be even better if lines() properly recognized both kinds of line-endings. That's certainly the more common operation. I can hardly imagine a good reason for wanting to split only some kinds of lines - and if one needs that, a generic "split at this byte" would have "split at \n" as an instance.
Would it violate Rust's compatibility promise to change lines() to properly recognize both kinds of line endings?

[mbrubeck]

Fixed by #1212.

[glaebhoerl]

(Did you want to close as well?)

[mbrubeck]

Yes, thanks.