Issue #2419857 by Wim Leers, alexpott: Responsive image and View mode schemas should use the config_entity type, can then be simpler

Issue #2378055 by Gábor Hojtsy: Reorganise config schema for entity_form_display / entity_view_display

Issue #2271529 by attiks, alexpott, Lowell, YesCT, Jelle_S | mdrummond: Move breakpoint settings to theme and module *.breakpoints.yml files at root level.

Issue #2080823 by alexpott, swentel, Wim Leers: Create API to discover content or config entities' soft dependencies and use this to present a confirm form on module uninstall.

Issue #2124377 by ellishettinga, Jelle_S, attiks, mdrummond, Schnitzel, InternetDevels: Rename "Picture" module to "Responsive Image" module.

Issue #2165835 by yched, tstoeckler: Rename EntityDisplay to EntityViewDisplay in accordance with its interface.

Issue #2167623 by danilenko_dn, sidharthap, Nitesh Sethia, krishnan.n, aitiba, alexpott, ashwinikumar, Barrett, damiankloip, deepakaryan1988, foxtrotcharlie, ianthomas_uk, neetu morwani, nonsie, piyuesh23, Sharique, sivaji, sushantpaste, swentel, vijaycs85, YesCT: Add test for all default configuration to ensure schema exists and is correct.