Add `enable_volume_normalisation` option

[DarkMatterMatt]

This PR adds support for enabling volume normalisation. It's completely opt-in and does not change any existing behaviour

Currently volume normalisation is disabled and cannot be enabled. Some songs play at significantly different volumes and normalisation makes these tracks approximately the same volume (at the cost of a minor decrease in audio quality)

See the librespot documentation for more information on how enable-volume-normalisation works

---

To test this option:

1. With volume normalisation disabled, play It's Time by Gavin Mikhail and then I See Fire by Ed Sheeran
2. Hear that one is much louder than the other
3. Enable volume normalisation
4. Save changes & restart the addon a. If the log level is debug, see that enable-volume-normalisation is present in the Command line argument(s) section
5. Play the songs again, hear that they are closer to the same volume

[github-actions[bot]]

There hasn't been any activity on this pull request recently. This pull request has been automatically marked as stale because of that and will be closed if no further activity occurs within 7 days. Thank you for your contributions.

[DarkMatterMatt]

.

[github-actions[bot]]

There hasn't been any activity on this pull request recently. This pull request has been automatically marked as stale because of that and will be closed if no further activity occurs within 7 days. Thank you for your contributions.

[DarkMatterMatt]

.

[github-actions[bot]]

There hasn't been any activity on this pull request recently. This pull request has been automatically marked as stale because of that and will be closed if no further activity occurs within 7 days. Thank you for your contributions.

[coderabbitai[bot]]

Walkthrough

The recent updates introduce a new configuration option, enable_volume_normalisation, to the Spotify add-on for HomeAssistant. This feature allows users to normalize the volume across different tracks, enhancing the listening experience. The changes span the documentation, configuration files, service scripts, and translations to support this new option.

Changes

File/Group	Change Summary
spotify/DOCS.md	Added a new option enable_volume_normalisation to the HomeAssistant configuration.
spotify/config.yaml, spotify/translations/en.yaml	Introduced enable_volume_normalisation configuration option in YAML and translations.
spotify/rootfs/etc/services.d/spotifyd/run	Added functionality for volume normalization in the Spotify service script.

Poem

In the land of rhythm and sound,
A new feature has been found. 🌟
Volume levels, now aligned,
For a smoother music bind. 🎶
HomeAssistant, with grace,
Ensures all tracks embrace. 🎵
Enjoy the harmony, without a trace! 😌

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[github-actions[bot]]

There hasn't been any activity on this pull request recently. This pull request has been automatically marked as stale because of that and will be closed if no further activity occurs within 7 days. Thank you for your contributions.