Play sounds on call actions

[nickvergessen]

Fix #2345
Fix #1072

(as discussed with @jancborchardt ):

• Play a sound when someone joins a call (only if not played within the last 5 seconds)
• Play a sound when someone leaves a call (only if not played within the last 5 seconds)
• Play a waiting sound when you are alone in a call (only 3 times)
• Have a setting to opt out of noises completely
• Check if we can play a sound when a call comes in, or are browsers too annoying in blocking it? (ref Add basic sound notification #5335 (comment) + Sound on talk notifications notifications#116 (comment) )
• Add a note that sounds can't play on safari atm
• Check CSP changes

[marcoambrosini]

within the last 5 seconds

Isn't it too much?

[marcoambrosini]

Check if we can play a sound when a call comes in, or are browsers too annoying in blocking it?

We should probably leave it till there's a more reliable way to do this?
I mean, If you know as a user that the you should expect a sound, you might start to rely on it as a notification, but if things are so precarious there we might just create confusion by doing this

[nickvergessen]

within the last 5 seconds

Isn't it too much?

The sound file is already ~3 sec long, so if it starts again after 5 seconds, there were 2 seconds of break. If you think about bigger calls this already sounds problematic enough. But that is why @jancborchardt and me picked 5 seconds in the end

[nickvergessen]

Ready for final testing from my side

[marcoambrosini]

In as is as discussed but I'd like to leave two comments here:

• IMO sounds are too long and we should cut them, they should be snap like long, not several seconds long;
• I find the sound when starting the call a bit annoying, I'd remove it altogether;

[nickvergessen]

• Sound also plays when a participant not in the call leaves the room

[nickvergessen]

Fixed the problem with leaving as a chat-user only