printf newline fix and resource optimization

[wmmc88]

We should enable minimal-printf to reduce printf overhead (RAM usage and Flash usage): https://os.mbed.com/docs/mbed-os/v6.8/apis/printf-and-reducing-memory.html

We should also investigate why /r is needed for newlines on windows. MBED should be automatically adding the carriage returns. See this comment: https://github.com/uwrobotics/MarsRover2020-firmware/pull/304#discussion_r589110003