Issue #3027653 by clayfreeman, tim.plunkett, Pavel Ruban, raman.b, ankithashetty, cboyden, larowlan, mpotter, phenaproxima: Allow block and layout plugins to determine if they are being previewed

Issue #2991683 by bircher, Krzysztof Domański, alexpott, Tim Bozeman, ricardoamaro, mpotter, tstoeckler, larowlan: Move configuration transformation API in \Drupal\Core\Config namespace

Issue #3047812 by bircher, Krzysztof Domański, alexpott, ricardoamaro, larowlan, borisson_, mpotter: Add a Config Transformation event dispatching during config import and export

Issue #2980712 by bircher, alexpott, yogeshmpawar, mpotter, borisson_: Define config directory in settings

Issue #2787185 by botris, mikelutz, kekkis, mikeryan, lemuelsantos, mvbaalen, quietone, BenStallings, mpotter, heddn: track_changes does not work when the map is joinable

Issue #3036193 by bircher, mpotter, larowlan, alexpott: Add ExportStorage to allow config export in third party tools

Issue #3016429 by bircher, mpotter, alexpott, johndevman, borisson_, Upchuk, larowlan: Add a config storage copy utility trait and fix ConfigManager::createSnapshot

Issue #2957425 by tedbow, johndevman, mpotter, tim.plunkett, hawkeye.twolf, alexpott, Berdir, samuel.mortenson, xjm, kevincrafts, jibran, amateescu, larowlan, twfahey, EclipseGc, sjerdo, japerry, mtodor, phenaproxima, johnzzon, mglaman: Allow the inline creation of non-reusable Custom Blocks in the layout builder

Issue #2848089 by Sam152, mpotter, gnuget, kriboogh, joelpittet: Unable to set a moderation_state value for unsaved entities that are assigned an ID

Issue #2788777 by alexpott, bircher, jribeiro, Eli-T, mpotter, douggreen, GoZ, DamienMcKenna, Dane Powell, jibran, szeidler, Alumei, andypost, dawehner, johndevman: Allow a site-specific profile to be installed from existing config