Improvement : add Input devices to audio source

[WarDrake]

It'd be great if we could select the input devices as the audio source for the program.
It would make for great automations if that was a posibility.

[GameGrime]

Only over one year later, I edited a bit of the code to add in a rudimentary audio input selection.

https://github.com/GameGrime/IoT-Audio-Visualization-Center