Power Display: Add ability to change monitor R,G,B colour settings.

### Description of the new feature / enhancement

3 slider controls to independently adjust monitor Red, Green and Blue Drive (Video Gain).

### Scenario when this would be used?

This would allow fine-tuning of monitor hardware colour balance/temperature and intensity.

Also preferable to the software-based Windows 'Night Light'.

### Supporting information

_No response_

Start by locating the Power Display utility and its existing display-control entry points. Check whether Windows exposes monitor RGB drive controls through the APIs already used by the utility. Done means the interface provides independent Red, Green, and Blue sliders that adjust monitor colour balance and intensity.

Written by the indexing model from the issue text.