Description

This adds support for fetching loudness levels. This is used in Plexamp and Dash to show a waveform of the currently playing track. See here for a screenshot of what I mean.

Type of change

• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated the docstring for new or existing methods
• I have added tests when applicable

I have not added tests (yet). Python is not my first language and I'm having a bit of trouble wrapping my head around how the test suite works.