Summary of the new feature/enhancement

The new Windows Terminal should have an option to set "HKCU\Console" as the source of its color theme instead of specifying the colors in the JSON.

If this were to be the default setting it would make transitioning easier as a users previously customized theme just carries over to WT. Even if it were not the default though, the option to do this would be nice to enable the user to easily theme both conhost and wt consistently from one place instead of having to maintain two configurations (registry for conhost, json for wt)

Proposed technical implementation details (optional)

"Source Registry settings" (or similar name) should be added as an option for the theme, if a settings GUI is planned then it would be sitting right along the other color schemes inside the theme-selection combobox. Alternatively, it could be a checkbox sitting above the Theme-selection combobox that disables the combobox when checked. Either way, choosing this option, wt would source its color configuration from the ColorTableXX and CursorColor keys in HKCU\Console