Changed

• Changed --license flag output to directly print the licenses where applicable rather than print the URL to the online version of the licenses.
• Changed the logger to support rolling. The log filename has been changed to <command>.log. Each invocation of any command will append to its respective log file. Once exceeding a certain file size limit, the log will rollover to a new file with format <command>.<n>.log. A total of five rollover files are kept at most.
• Setting NRFUTIL_LOG_PREFIX no longer has an effect.