Windows: Delay break during communication sessions

[letmaik]

https://docs.microsoft.com/en-us/windows/win32/coreaudio/providing-a-custom-ducking-experience

Meeting apps typically use a communication device session during a call. It would be nice if pomotroid would listen to such events and provide an option to delay a break until the call it over.

Before looking at this deeper we should do a survey of common meeting apps to see if they actually use communication sessions. Otherwise it would be a bit pointless. I'll try to fill out the following list with ✔️/❌/❓ marks to provide an overview.

• ❌ Microsoft Teams
  • https://answers.microsoft.com/en-us/msteams/forum/all/why-is-teams-not-classified-as-communications/5d244d8f-5d70-4878-bc1e-d06130e19f92
• ❓ Skype
• ❓ Zoom
• ❓ Slack
• ❓ Chrome (e.g. Google Meet)
• ❓ Firefox (e.g. Google Meet)

EDIT: In fact, it seems that at least on my machine audio ducking isn't working at all. I do remember it working at some point, but could be a year ago or more. I tried the Windows SDK samples (https://docs.microsoft.com/en-us/windows/win32/coreaudio/duckingcapturesample and https://docs.microsoft.com/en-us/windows/win32/coreaudio/duckingmediaplayer#downloading-the-sample) but there seem to be no ducking events being sent/captured. This doesn't seem to be a reliable mechanism to figure out whether a meeting is happening.

EDIT 2: I'm going to close this again as I couldn't figure out an alternative way to detect whether a meeting/call is happening or the microphone is in use.

[Splode]

@letmaik thank you for looking into it and putting together such comprehensive documentation!