Issue #2282519 by alexpott, cilefen: Fixed Add content dependency information to configuration entities.

Issue #2246647 by mpdonadio, cilefen, YesCT, tim.plunkett: Rename PluginBag to LazyPluginCollection.

Issue #2340123 by Wim Leers: Setting cache tags can be tricky: use strings instead of nested arrays to improve DX.

Issue #2260457 by alexpott, beejeebus: Fixed Allow config entities to remove dependent configuration keys when dependencies are deleted due to module uninstall.

Issue #2224761 by Gábor Hojtsy, alexpott, pfrenssen, effulgentsia, xjm, mlncn: Add a generic way to add third party configuration on configuration entities and implement for field configuration.

Issue #697760 by sun: Replace getInfo() in tests with native phpDoc + annotations (following PHPUnit).

Issue #2256679 by alexpott, tim.plunkett: Fixed Use config schema to determine which config entity properties to export regardless of whether they are public or protected.

Issue #2267329 by tim.plunkett | joachim: Move EntityWithPluginBagInterface out of Drupal\Core\Config\Entity and make it useful for more than one bag.

Issue #2217749 by Wim Leers, Jalandhar, visabhishek, damiankloip: Entity base class should provide standardized cache tags and built-in invalidation.

Issue #2226027 by tim.plunkett: ConfigEntityBase::preSave() tries to load the original entity but instead loads itself.

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.