Implement high contrast UI theme

[owenpshaw]

When windows is in high contrast mode, draw the quick strip, buttons, and help in a high contrast way

[GreggVan]

Hi
This is more difficult than you might think at first blush. On Windows there are 3 high contrast modes that the computer might be set in (plus users can 'roll their own'. I think best way to handle this is to define our "parts" of the UI according to their scheme - in which case our bar will follow the High Contrast settings for all of the modes. OR we can just define that in high contrast (and dark mode?) we will look like X (high contrast and dark). Might be simplest and our MorphicBar would stand out more since it would not be identical to the other windows in high contrast mode.

In Mac there are essentially no high contrast modes like there are in windows. They do have a contrast setting so this could control that.