Notification sounds

[ginnyTheCat]

Description

Adds support for sound notifications and a settings option to disable this behavior.

I'm however not sure whether I added the credit for the sound resource correctly to the about section.

Fixes #173

Type of change

• New feature (non-breaking change which adds functionality)

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings

Preview: https://623363d2153c704052789d3b--pr-cinny.netlify.app
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[ajbura]

The notification sound should work independent from desktop notification permission.

1. sound can play even if desktop notification permission is disabled.
2. notification sound can be toggle regardless of desktop notification permission.
3. making desktop notification silent if notification sound is off is good idea, so it can stay as it is.
4. using custom sound for desktop notification is good idea, so it can stay as it is.

apart from this notificaiton.ogg can be moved to /public/sound

[ginnyTheCat]

I personally don't like when a website plays a notification sound without an actual notification. I never know where the sound comes from. FluffyChat does this and has it's really annoying with no way of disabling it.

[ajbura]

Notification doesn't mean desktop notification always. Desktop notifications already play system sound but what's lacking is the in-app notification sounds. For eg, invites, messages from room that you have on high priority, calls.

Without in-app notification sounds people can easily miss these updates. From a personal experience I have missed DM invites many times and after hours checked the invite button, same happened for pings.