pcr: gnuboot-utils: rename to coreboot-utils and split me_cleaner.
    
    We have some discrepancies between the package license and the license
    of some of the tools we ship. In addtion none of the tools have a
    proper package description.
    
    Given that some of the tools are dangerous if used improperly, having
    a description can encourage users to try the safe tool and discourage
    them to try unknown tools.
    
    Note that many of the dangerous tools are also used by users in their
    setup (like nvramtool that is not dangerous when using Coreboot but
    could be if used with a nonfree BIOS).
    
    So we started to split me_cleaner which is GPLv3+ and not GPLv2-only
    and also packaged its documentation along the way.
    
    Signed-off-by: Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>