- Fix typelength mask to 0x3f, was 0x1f.
- Fix OEM data structure, p1_gbt and p2_gbt are in the same byte.
- Fix OEM data byte 1 arrangement, fields were in the wrong place.
- Fix typelength for part number in Board Info Area, was taking product typelength.
- Fix Board Info Area checksum calculation, the "end of fields" typelength was
  assigned after checksum calculation.
- Fix OEM manufacturer ID byte order to LS Byte first, was MS Byte first.
- Add common header format in common header byte 0.
- Fix DC load structure length calculation and write to file.
  As the structure contains uint8_t and uint16_t, the compiler is aligning
  all entries to 16-bit boundary. This was resulting in a extra 0x00 byte,
  increasing the structure length by 1 byte.
- Internal Use Area is now optionnal.