[Feature] automatic dark mode support for colored lists

[anOatFlake]

Is your feature request related to a problem? Please describe. Trello started a beta for their darkmode desing, it would be great if the colored lists would have a second (perhaps automatic) value that switches in the case of the activated dark mode

Describe the solution you'd like It would be great if the dark mode color is automatically generated based on the light mode color that is set

Describe alternatives you've considered A second value where you can customize the dark mode version