[BETA] New Icons and some chores

This pre-release features some new icons for the sensor, select and numbers entities.
Additionally the project was adjusted according to the deprecation changes mentioned in this blog entry:
https://developers.home-assistant.io/blog/2023/12/28/support-feature-magic-numbers-deprecation

The source now returns the value wifi when the media_app_name is AirPlay or Spotify

Full Changelog: 0.3.0b1...0.3.0b3