Write a color pattern line to blink1.
@note on mk1 devices, this saves the pattern line to nonvolatile storage.
@note on mk2 devices, this only saves to RAM (see savePattern() for nonvol)
@param dev blink1 device to command
@param r red part of RGB color
@param g green part of RGB color
@param b blue part of RGB color
@param pos pattern line number 0-max_patt (FIXME: put note about this)
@return -1 on error, 0 on success
Write a color pattern line to blink1. @note on mk1 devices, this saves the pattern line to nonvolatile storage. @note on mk2 devices, this only saves to RAM (see savePattern() for nonvol) @param dev blink1 device to command @param r red part of RGB color @param g green part of RGB color @param b blue part of RGB color @param pos pattern line number 0-max_patt (FIXME: put note about this) @return -1 on error, 0 on success