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

Issue #2377117 by mglaman, rpayanm, pcambra: Replace all instances of entity_load('field_storage_config') and entity_load_multiple('field_storage_config') with static method calls

Issue #2324055 by dawehner, cilefen, znerol: Split up the module manager into runtime information and extension information

Issue #2377115 by mglaman: Replace all instances of entity_load('field_config') and entity_load_multiple('field_config') with static method calls

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

Issue #2287727 by yched, swentel, alexpott: Rename Field[instance]Config classes and entity types (again).

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

Issue #2095303 by swentel, plopesc, Berdir, claudiu.cristea, yched: Rename 'field_entity' to 'field_config' and 'field_instance' to 'field_instance_config'.

Issue #2171683 by sun, alexpott, tstoeckler, larowlan: Remove all Simpletest overrides and rely on native multi-site functionality instead.

Revert "Issue #2171683 by sun, tstoeckler, larowlan: Remove all Simpletest overrides and rely on native multi-site functionality instead."

This reverts commit 91db25eb. Broke web
tests.

Issue #2171683 by sun, tstoeckler, larowlan: Remove all Simpletest overrides and rely on native multi-site functionality instead.

Issue #1199946 by alexpott, fubhy, bojanz, steinmb, chx, catch: Fixed Disabled modules are broken beyond repair so the 'disable' functionality needs to be removed.

Issue #1497374 by yched, chx, amateescu, plach, Damien Tournoud, fago, swentel: Switch from Field-based storage to Entity-based storage.

Issue #2056761 by janstoeckler: Remove Unused local variable  from /core/modules/field/lib/Drupal/field/Tests/FieldImportCreateTest.php.

Issue #1822000 by Berdir, plach, amateescu, yched: Remove Drupal\field_test\Plugin\Entity\Type\TestEntity in favor of EntityTest.

Issue #1998576 by beejeebus, alexpott, swentel: Make the config import process use full config trees again.

Issue #1890784 by alexpott, YesCT, heyrocker, tim.plunkett, EllaTheHarpy, beejeebus: Refactor configuration import and sync functions.