Idea: Split up project to have serialport and serialport-cli

[DomiR]

In accordance with many other projects that support cli commands, I would love to see this project split up into two components. Keeping the core in this repository lean and clean and using another package for cli support, including rather large dependencies.

For an easy migration I would would recommend to add a stub bin that prints instructions to use npm install -g serialport-cli.

[reconbot]

Working on it #1606 Thanks!