Repurpose the existing --unbuffered/-u flag (previously a POSIX no-op)
to enable unbuffered input reading using fill_buf()/consume() instead
of read_until(b'\n'). This allows partial lines to display immediately
when piping streaming input like `tail -f` into bat.
- Add unbuffered field to Config and InputReader
- Add read_line_unbuffered() using BufRead::fill_buf()/consume()
- Add flush() to OutputHandle, called after each line in unbuffered mode
- Auto-disable line numbers in unbuffered mode to avoid partial line confusion
- Update help text, man page, and shell completions
- Add unit tests and integration tests
* Add a --style=default option
* Added --style=default test and CHANGELOG entry
* Format CHANGELOG.md options with quotes
Co-authored-by: Martin Nordholts <enselic@gmail.com>
* Update help text for '--style'
* Make --style=default the default option
* Update style descriptions: "basic" -> "recommended"
* Add integration test for --style=default as default
* Update clap long help for --style