Issue #2795489 by mpdonadio, gambry, Yogesh Pawar, cilefen, Munavijayalakshmi, wturrell, jhedstrom, pjohn, catch, xjm, ednawig: 2038 bug with PHP timestamps on 32-bit systems - warn users?

Issue #2776975 by joelpittet, dawehner, tim.plunkett, xjm, pfrenssen: March 3, 2017: Convert core to array syntax coding standards for Drupal 8.3.x RC phase

Revert "Issue #2795489 by mpdonadio, cilefen, ednawig: 2038 bug with PHP timestamps on 32-bit systems - warn users?"

This reverts commit bb25a5b7.

Issue #2795489 by mpdonadio, cilefen, ednawig: 2038 bug with PHP timestamps on 32-bit systems - warn users?

Issue #2716661 by anoopjohn: Fix 'Drupal.Commenting.FunctionComment' coding standard - Issues related to @see references

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

Issue #2491155 by mikeburrelljr, Mac_Weber, opdavies: Update drupal.org and kernel.org URLs in core modules (Follow-up to 2489912)

Issue #2457405 by stefan.r, andypost: DateTimePlus violates substitution principle of DateTime. Make it support PHP 7

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

Issue #2081153 by YesCT, lauriii, rdatar, miraj9093, Enxebre, smiro, alexpott: Remove unused local variables from core/tests.