Implement 4k support for UWP on Xbox

[tunip3]

Implement 4k support for UWP on Xbox.

Description

Enable 4k output on Xbox. Currently we get the display res on Xbox instead of using the window size as the window size will never change from 1080p regardless of display res.

Fixing the display res based on the console type may be something worth considering but I think that in this case no support for in-between resolutions like 1440p should be supported and instead the window size should be the max output the console is capable of with rendering at lower resolutions for performance reasons being handled by the games.

This is incomplete and likely to have issues.

Existing Issue(s)

#6765