Revert "Issue #2244513 by kim.pepper, phenaproxima, 20th, andrei.dincu, beejeebus, Berdir, jibran, alexpott, andypost, larowlan, Chadwick Wood, Wim Leers, acbramley, YesCT, sun, tim.plunkett, chx: Move the unmanaged file APIs to the file_system service (file.inc)"

This reverts commit 56be1a03.

Issue #2244513 by kim.pepper, phenaproxima, 20th, andrei.dincu, beejeebus, Berdir, jibran, alexpott, andypost, larowlan, Chadwick Wood, Wim Leers, acbramley, YesCT, sun, tim.plunkett, chx: Move the unmanaged file APIs to the file_system service (file.inc)

Issue #2937853 by idebr, mfernea, SherFengChong, alexpott, borisson_: Fix 'Drupal.Formatting.MultipleStatementAlignment' coding standard

Issue #1252606 by rlhawk, dsnopek, attiks, alansaviolobo, MariaDenysyuk, j0rd, sushyl, Adysone, Alan Evans, mondrake, andypost, alexpott, sun, tstoeckler: Add crop anchor option to Scale and Crop image effect

Issue #2961691 by alexpott, Berdir, timmillwood, idebr: Change SYMFONY_DEPRECATIONS_HELPER back to strict

Issue #2901730 by mfernea, ankitjain28may, idebr: Fix 'Squiz.WhiteSpace.FunctionSpacing' coding standard

Issue #2935255 by Jo Fitzgerald, kim.pepper, voleger, alexpott, martin107, jibran, catch: Remove all usages of drupal_get_message and drupal_set_message in core lib

Issue #2911319 by alexpott, dawehner, mglaman, mradcliffe, heddn, pbirk, danquah, maxstarkenburg, geerlingguy, vaplas, Chelsee, ressa, Chi, jonathanshaw, Mile23, andypost, larowlan, phenaproxima, droffats, kim.pepper, scotty, dsnopek, cashwilliams, borisson_, Mixologic, gerzenstl, David Radcliffe: Provide a single command to install & run Drupal

Issue #2926633 by alexpott, dawehner, Mile23, mglaman, Wim Leers, jibran, larowlan, Lendude, Berdir: Provide a script to install a Drupal testsite

Issue #2933424 by David_Rothstein, harsha012, jhodgdon, vaplas: English-specific links to php.net shouldn't be used in non-translatable strings

Issue #2927806 by alexpott, mondrake, jibran, Mile23: Use PHPUnit 6 for testing when PHP version >= 7.2

Issue #2870194 by alexpott, Mile23, jibran, larowlan, tim.plunkett: Ensure that process-isolated tests can use Symfony's PHPunit bridge to catch usages of deprecated code

Issue #2869120 by penyaskito, Mixologic, Berdir: run-tests.sh ignores classes if they have whitespace before the declaration using --directory

Issue #2850797 by maxocub, dawehner, alexpott: Prepare our phpunit tests to be BC compatible with phpunit 5.x/6.x

Issue #2829484 by vegantriathlete, 20th, xjm: Incorrect spelling of possessive "its own" in multiple comments

Issue #2804675 by alexpott, hideaway: Tests using TestDatabase class are stuck in an infinite loop in Windows (8.2.0-rc2 only)

Issue #2776071 by damiankloip, neclimdul, Mixologic: run-tests.sh does not return a non zero status when tests fail with exception

Revert "Issue #2776071 by damiankloip: run-tests.sh does not return a non zero status when tests fail with exception"

This reverts commit b026909e.

Issue #2776071 by damiankloip: run-tests.sh does not return a non zero status when tests fail with exception