Add Audio Options for Screen Sharing

This suggestion is to add audio options for screen sharing.

Current Behaviour:

When sharing screen on Discord, audio is only shared if a specific application is selected, and the audio that is shared is only the audio from that application.

Suggested Change:

The suggested change is to add audio options when sharing. E.g. "Application Audio", "Select Device Audio...", and "No Audio".

Why?:

This would allow people to share their screen while allowing them to play sounds from another application.

Specifically for me, I came across this while sharing a game with some friends and also wanting them to hear alerts from another application.