MindSensors NXTLineLeader commands

NXTLL_CMD_BLACK NXTLL_CMD_EUROPEAN NXTLL_CMD_INVERT NXTLL_CMD_POWERDOWN NXTLL_CMD_POWERUP NXTLL_CMD_RESET NXTLL_CMD_SNAPSHOT NXTLL_CMD_UNIVERSAL NXTLL_CMD_USA NXTLL_CMD_WHITE

#define NXTLL_CMD_WHITE   0x57 White balance calibration.