Fixed rendering-alignment issues on WinPhone 8.1, when the device was rotated

If a Windows Phone 8.1 device was rotated to anything but Portrait mode,
the Direct3D 11 renderer's output wouldn't get aligned correctly with the
screen.
Fixed bug: touch input on WinPhone 8.0 was wrong, in some cases

When a Windows Phone 8.0 app was rotated to anything but Portrait mode, touch
input coordinates, as well as virtual mouse coordinates, were usually getting
reported as coming from the wrong part of the screen.