MOst of the files here are taken from Arduino version 15 and covered by
the file, LICENCE, with these exceptions:

RPLidar.cpp, RPLidar.h rplidar_cmd.h rplidar_protocol.h rptypes.h:
    Copyright (c) 2014, RoboPeak - copyright notices are in individual files

analogWrite.cpp analogWrite.h - Copyright (c) 2019 ERROPiX, MIT license