Merge branch 'jt/rev-list-z'

"git rev-list" learns machine-parsable output format that delimits each field with NUL. * jt/rev-list-z: rev-list: support NUL-delimited --missing option rev-list: support NUL-delimited --boundary option rev-list: support delimiting objects with NUL bytes rev-list: refactor early option parsing rev-list: inline `show_object_with_name()` in `show_object()`