Issue #1839068 by Berdir, fago: Implement the new entity field API for the file field type.
Issue #1910318 by katbailey: Make path resolution the responsibility of a series of PathProcessor classes, rather than one PathSubscriber class.
Issue #1914366 by vijaycs85, Gábor Hojtsy, alexpott: Move all configuration schema files into a schema subdirectory.
Issue #1891516 by sun, Berdir, chx: Remove $install parameter from DrupalUnitTestBase::enableModules(), encourage to create individual schema tables only.
Issue #1904214 by vijaycs85: Fixed Installer auto-selects languages that don't have a translation, causing a requirements error.
Issue #1921740 by Floydm: Remove references to obsolete update_free_access variable in UPGRADE.txt
Issue #1913856 by tim.plunkett: Convert Views UI forms to use FormInterface.
Applied patch
inject state an move test class to DrupalKernel
fixed documentation, reverse service order
remove form state changes
Renamed to TerminableInterface
added missing use
remove wrong test change
iniitalize services property
renamed all the things
moar renames
fixed comments, refactored test, removed safety checks.