Issue #3260007 by mondrake, yogeshmpawar, daffie, andypost: Decouple Connection from the wrapped PDO connection to allow alternative clients

Issue #3207968 by quietone, longwave, Spokje: Replace @codingStandards comments with phpcs: comments

Issue #2572631 by ZeiP, Mile23, mfernea, pk188, dimaro, kporras07, attiks, klausi, dawehner: Fix 'Drupal.Classes.InterfaceName' coding standard

Issue #2665992 by alexpott, klausi, heykarthikwithu, xjm, tstoeckler: @file is not required for classes, interfaces and traits

Issue #1392754 by tss, justAChris, jhodgdon: Comply with new documentation standards for @file for namespaced class files