Handle backspace and back keys to go back
From Trac https://trac.videolan.org/vlc/ticket/19518
Handle backspace key and navigate back key to go back the same as software back button
https://docs.microsoft.com/en-us/uwp/api/Windows.System.VirtualKey
Back
and GoBack
It would be also nice to handle
GoForward
- going forward in stack after going back
GoHome
- go to main screen