Allow easy customizing of the tray icon

[Geroyuni]

At least the static eartrumpet one, to the image of choice.

I'd also be really grateful if anyone can point out a way in which this is already possible.

[gaberad]

Related to this, would it be possible have different icons show based on the selected output?

e.g. the default speaker icon for speakers, headphone icon for headphones etc

https://github.com/davkean/audio-switcher has a nice headphones icon that fits with the rest of the tray icons

[JavierSegoviaCordoba]

Selected device in the tray icon should be great