kernel

Merging from 5.2.x to 5.3.x

• Fixes INP-1758 - Support PHP_CodeSniffer 3.x

  r16637: (no details)

• Fixes INP-1827 - Connect a testing framework

  r16761: Differential Revision: http://qa.in-portal.org/D451

• Fixes INP-1829 - Add "keep_cents" field option for "kFormatter::Format" method

  r16763: Differential Revision: http://qa.in-portal.org/D433

• Fixes INP-1834 - Connect "mtdowling/cron-expression" library

  r16769: Differential Revision: http://qa.in-portal.org/D438

• Fixes INP-1869 - Add vendor autoloader support for Class Locator

  r16792: Differential Revision: http://qa.in-portal.org/D475

• Fixes INP-1879 - Adjust Phabricator URL to use SSL

  r16799: Differential Revision: https://qa.in-portal.org/D490

Conflicts:

• composer.json
• composer.lock
• core/install/prerequisites.php
• core/install/step_templates/sys_requirements.tpl
• core/install/steps_db.xml
• core/kernel/application.php
• core/units/helpers/cron_helper.php