Issue #1929816 by lokapujya, penyaskito, reszli, JStanton, Gábor Hojtsy, catch: Remove all references to/implementations of hook_schema_0().

Issue #2141539 by yched, JStanton, InternetDevels, blesss: Rename FieldItemListInterface::filterEmptyValues() to filterEmptyItems().

Revert "Issue #2141539 by yched, JStanton, InternetDevels, blesss: Rename FieldItemListInterface::filterEmptyValues() to filterEmptyItems()."

Conflicts with a beta blocker; rolling back temporarily.

This reverts commit dc4327ba.

Issue #2141539 by yched, JStanton, InternetDevels, blesss: Rename FieldItemListInterface::filterEmptyValues() to filterEmptyItems().

Issue #2149977 by JStanton: Run-tests.sh no longer respects specifying a port with the --url option.