Supported features values deprecation

[tcnuk]

The extension appears to be using some deprecated Home Assistant features and needs updating before Home Assistant Core 2025.1, where they will be removed. On start-up of Home Assistant with this extension integrated, I get the following log message:

2024-01-29 16:27:53.393 WARNING (MainThread) [homeassistant.helpers.entity] Entity media_player.cxa (<class 'custom_components.cambridge_cxa.media_player.CambridgeCXADevice'>) is using deprecated supported features values which will be removed in HA Core 2025.1. Instead it should use <MediaPlayerEntityFeature.VOLUME_MUTE|TURN_ON|TURN_OFF|SELECT_SOURCE|SELECT_SOUND_MODE: 67976>, please create a bug report at https://github.com/lievencoghe/cambridge_cxa/issues and reference https://developers.home-assistant.io/blog/2023/12/28/support-feature-magic-numbers-deprecation

If nobody else fancies picking this up, I might be able to take a look at some point.