Issue #2030637 by yched, Mile23, daffie, Alumei, tidrif, chertzog, Berdir, swentel, ofry: Expand FieldConfig/BaseFieldOverride/FieldConfigBase with methods

Issue #2457887 by prateekMehta, stefan.r, rpayanm, alexpott: Use Utility\SafeMarkup class instead of Utility\String for placeholder(), checkPlain(),format() functions

Issue #2416409 by alexpott, bojanz: Delete dependent config entities that don't implement onDependencyRemoval() when a config entity is deleted

Issue #2384665 by benjy, penyaskito: Follow-up: FieldConfigBase::calculateDependencies() fatal error is unhelpful

Issue #2271419 by alexpott, larowlan: Fixed Allow field types, widgets, formatters to specify config dependencies.

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

Issue #2347711 by yched, undertext: Fixed FieldItemlListInterface::processDefaultValue($default_value) is expected to massage polymorphic data.

Issue #2346911 by larowlan, vijaycs85, Berdir | sihv: Fixed Base field overrides have incorrect default value callable properties.

Issue #2312093 by alexpott, yched, andypost, swentel | xjm: Rename FieldInstanceConfig to FieldConfig.

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 #1976158 by Berdir | msonnabaum: Rename entity storage/list/form/render "controllers" to handlers.

Issue #2283977 by alexpott, Gábor Hojtsy, effulgentsia, fago: Create a new ConfigEntity type for storing bundle-specific customizations of base fields.