Fix Some GPS formats not writing to the event history gps_s string due to mismatching src values (UDT NMEA and LIP);
Fix bug in ComputeCrcCCITT16d where the len value cannot exceed 255 by recasting len as uint32_t instead of uint8_t; #288
Clarify when UDT Data Blocks (R12) is Confirmed or Unconfirmed Data;