midi-macro release v0.1.0

Changelog

• Add port option to the YAML config for selecting the MIDI device.
• list command to list MIDI devices.
• run command to start the event listener.
• Simplified event handlers (to be improved in later releases).
• New task for knobs. Also easier way for knob handlers to use previous values.
• Improved CLI interface using cobra

Thanks to @winder @tfager for their contributions.