Noise library and examples for basic FFT and frequency binning

[Gadgetoid]

After experimenting with capturing and plotting various noise types I've put together a starter library for noise profiling on Enviro+.

To use this code you'll need to:

sudo pip3 install sounddevice
sudo pip install sounddevice
sudo apt install libportaudio2

TODO:

• Test & get a feel for the results
• Add DocStrings
• Add (optional) compensation for human perception of amplitude at different frequencies
• Add dependencies to installer (sounddevice and portaudio libportaudio2)

[Bugierek]

Thank you for working on the noise sensor :)
I've run both examples and there's an issue with noise-profile.py due to lack of measure attribute:

Traceback (most recent call last):
File "noise-profile.py", line 29, in
low, mid, high, amp = noise.measure()
AttributeError: 'Noise' object has no attribute 'measure'