Handle `WM_QUERYENDSESSION` and `WM_ENDSESSION`

[thomaseizinger]

Is your feature request related to a problem? Please describe.

Allow the Windows installer to automatically close a running Tauri app that is running in the tray menu.

Describe the solution you'd like

Tauri apps to be gracefully closed during the install process.

Describe alternatives you've considered

I am not sure there are alternatives.

Additional context

The Guidelines for Applications describe that a Windows application should listen to the above mentioned signals.

Currently, tao only listens to the WM_CLOSE message. It would be useful to also create an event for WM_ENDSESSION that allows applications to directly shutdown.

Specifically, for apps that minimise themselves to the tray menu, WM_CLOSE is typically surpressed because we don't want the application to exit when the window is closed.

[Legend-Master]

Will take a look when I get time, this is also pretty useful for the app to get notified for system shutdown or log off so it could save its states

Also see rust-windowing/winit#1817