In plugins/fs/src/commands.rs read_until_bytes / LinesBytes, the line
feed sequence was matched at any byte offset, so UTF-16LE "ਗĀ"
(17 0a 00 01) or UTF-16BE "Āਗ" (01 00 0a 17) split mid code unit and every
following line was decoded misaligned.
Line feed and carriage return sequences now only match on a multiple of
their length from the start of the line. Unit tests with both examples
(they fail without the fix).
