F40: Add a base-graphical group and use it in Xorg-less KDE
    
    base-graphical provides the lowest common denominator set of packages
    for a desktop environment. At the moment this includes mesa drivers
    and a graphical plymouth theme for the boot animation etc.
    
    If your desktop is transitioning away from Xorg (base-x group)
    or was concieved with Wayland, this is the group for you.