Issue #2368019 by Mile23: Expand unit testing for Drupal\Core\Plugin\Context\ContextDefinition
Issue #1201452 by Heine, mgifford: Potential Vulnerability In DatabaseConnection_mysql
Issue #2378055 by Gábor Hojtsy: Reorganise config schema for entity_form_display / entity_view_display
Issue #2377115 by mglaman: Replace all instances of entity_load('field_config') and entity_load_multiple('field_config') with static method calls
Issue #1663166 by LewisNyman, Manuel Garcia, JamesLefrère, BarisW, sqndr, tompagabor: Clean up system admin css