[Feature request] Add option to minimize to tray

[baobaybong]

Thanks to the AutoJoin feature, I rarely find myself interacting with the UI, so it should be possible to put the app on system tray to save space on taskbar.

Moreover, sometimes when I accidentally close the app, reopening it would launch another Zoom instance even if I'm already in class (might be another issue?), which is annoying, especially when using the desktop client. Minimizing the app to tray when clicking X button would prevent this kind of 'accident'.

[trungnt2910]

This would be a WPF-specific feature, as Universal Windows Platform applications are sandboxed, and cannot interact with the Win32 API.

We might be able to achieve the same functionality on other platforms, such as a foreground service in Android, a service worker in the browsers,... but it will take a lot of time.

[trungnt2910]

Actually, there IS a way to move UWP applications to the systray, but it requires starting a child Win32 process. And I don't have much time to develop this, with numerous bugs going on...