Make AbstractCard based upon HeaderFooterLayout

use internally HeaderFooterLayout to lay out the header and footer of
the cards. in order to be 100% compatible it is still a bit hacky
as two things have the same cotentitem they will race for who gets to
move/resize it.

However, it's still much simpler than the old implementation.
A cleaner solution would imply changing the api which might be a bit too
late now