Use case

Currently it's only possible to modify focusColor and hoverColor for selection controls. The pressed overlay color is based of the activeColor. We should make it possible to have a different overlay color independent from the activeColor.

Proposal

Add a MaterialStateProperty<Color> overlayColor argument to the selection controls that allow us to modify it in all its MaterialStates.

Also update the selection control themes to make the overlayColor used in the pressed state.