Different types of audio playback should be treated separately

For example notifications, alarms and media should all be treated separately. Each of the volumes of different audio types should be independent. I should be able to mute media playback like peertube videos from a high-level UI but still hear notification and alarm sounds and similarly for each different type of audio.

There should be a high-level mute control to mute all audio types.

Call audio should be distinct from all other types of audio.