Issue #203955 follow-up by Shawn DeArmond: Fix installation docs and field description to note that database now can be created at install time.

Revert "Revert the revert of Issue #1849004 by chx, xjm: One Service Container To Rule Them All. It was innocent after all."

This reverts commit a1638b87.

This reverts commit 761ac679.

Issue #680546 by swentel, jramby, Cottser, jonathan1055: Added a custom 'number of values' for 'multiple / multi-value' field. (e.g. nodereference, imagefield).

Issue #1571632 by cosmicdreams, marcingy, justafish, chx, KarenS, aspilicious, disasm, swentel, dawehner, rvilar: Convert regional settings to configuration system.

Issue #815144 by eiriksm, highrockmedia: Added Imagefields should have the option to require Custom Alt text.

Issue #880940 by realityloop, xjm, Jody Lynn, tim.plunkett, smortimore, dagmar: Added view/revert/delete revisions per content type.

Issue #1241938 by swentel, Niklas Fiekas, yched: Added support for #placeholder to relevant Field API widgets.

Issue #1843420 by ACF: Added Change block test variables - block_test_cache() and block_test_content() to state system.

Issue #1843462 by ACF, aspilicious: Change entity_test() variables - entity_test_translation(), entity_cache_test() and entity_cache_test_label() to the state system.

Issue #1783196 by dawehner, damiankloip, tim.plunkett: Get the views plugin manager from the DIC when possible.

Issue #882666 by mgifford, andrewmacpherson, sun: Fixed Core form descriptions shouldn't use a label when not associated with a form.

Issue #347988 by sun, Berdir, dawehner, Damien Tournoud, moshe weitzman: Move $user->data into own table.