Issue #2155635 by Berdir, tim.plunkett, dawehner: Allow plugin managers to opt in to cache clear during module install.
Issue #340723 by ParisLiakos, sun, Berdir, glennpratt, Cottser, swentel, tstoeckler, Xano, tim.plunkett, BassistJimmyJam: Make modules and installation profiles only require .info.yml files.
Issue #1934788 by sun, pplantinga: 'Administration role' setting in User Account settings form defaults to first, randomly available user role.