Autodetect serial ports

[computergeek125]

macOS, Linux, and Windows do not all use the same serial port syntax. We should have a way to specify it from the command line in make and/or do better serial port name listing on these platforms.

That way, the default Linux port is /dev/ttyUSBN, /dev/ttyACMN, /dev/ttySN where N is the port number, and the default macOS ports are /dev/tty.* where * is the string assigned by the serial driver. (or something like this)