fix licenses
    
    This addresses two topics:
    
    - The license/module key describes the license of the module (i.e. files
      in this repository) not that of the components contained in it.
    
    - The license/components key should be left empty and filled in by the
      module build tools. This way, the respective current licenses of the
      components used for building are put in, and we don't have to maintain
      their licenses in two places.