Use compact overlay by default if Windows 10 version supports it.

Add missing namespaces caused by rookie mistake...

Change W10 Build Target to 10.0.16299.0 (Revision 2)

Add IsCompactOverlaySupported getter to VideoPlayerVM for cleanup of safety checks in Settings/InitPipCommand.

Add missing awaits to async functions in InitPipCommand and AppViewHelper.

Fix InitPipCommand failure when VLC not maximized by adding returns after swapping to/from Compact Overlay viewmode.