Bug fixes

Should fix #2979889: "Show the first field as the table header" shift the first row one cell to the right, which may have shifted table header fields if labels weren't shown.

Should fix #2979889: "Show the first field as the table header" shift the first row one cell to the right, which may have shifted table header fields if labels weren't shown.

Development branch for the Drupal 8 version of the File Cache module.

Fixes Issue #3001073: normalizeArray shouldn't remove empty arrays. by gnuget, nedjo: normalizeArray shouldn't remove empty arrays

Accumulated minor improvements and documentation about handling stale data.

• Issue #3000876: Updated [Drupal core] from 8.5.7 to 8.6.1

• Issue #3001196: Enabled [BigPipe] Drupal core module by default