- Rework the line reading. This version uses a single expanding

- Rework the line reading.  This version uses a single expanding
  buffer rather than a main buffer and a "next line" buffer.  This
  version does not overflow the allocated memory (hopefully).  The
  previous version did when concatenating the continuation lines.
- Add protection to the HexCSVToHex to prevent overflow.
- Allow for conversion of larger hex values.  Tested on a real 2.6KB
  value.