Revert "Revert "Issue #3087482 by Mile23, greg.1.anderson, AaronMcHale, johndevman, mbaynton, alexpott: Add 'next steps' info to Composer installation output""

This reverts commit 32b0bacf.

Revert "Issue #3087482 by Mile23, greg.1.anderson, AaronMcHale, johndevman, mbaynton, alexpott: Add 'next steps' info to Composer installation output"

This reverts commit b547ffe6.

Issue #3087482 by Mile23, greg.1.anderson, AaronMcHale, johndevman, mbaynton, alexpott: Add 'next steps' info to Composer installation output

Issue #3087626 by greg.1.anderson, Mixologic, jibran, Mile23, alexpott, xjm: Convert drupal/core-recommended & c. into a subtree split

Issue #3088369 by mikelutz, alexpott, Berdir, Gábor Hojtsy, andypost, martin107, greg.1.anderson, dawehner, jibran, Wim Leers, Mile23, catch: Update Drupal 9 to Symfony 4.4-dev

Issue #2950132 by mondrake, alexpott, tom_ek, Gábor Hojtsy, Pasqualle, andypost, Mile23, larowlan: Support PHPUnit 7 optionally in Drupal 8, while keeping support for ^6.5

Issue #3082866 by Mile23, Mixologic, greg.1.anderson, alexpott, rfay: composer complains "Skipped installation of bin bin/composer for package composer/composer: file not found in package"

Issue #3087531 by jibran, xjm: Use Diactoros LTS version 1.7, not 1.8 which is out of security coverage

Issue #3031379 by heddn, Mile23, greg.1.anderson, Charlie ChX Negyesi, alexpott, Mixologic, jibran, catch, Lendude: Add a new test type to do real update testing

Issue #3084298 by greg.1.anderson: Make composer installer paths consistent between drupal/drupal and the project templates

Issue #2912387 by greg.1.anderson, Mile23, Mixologic, larowlan, jibran, alexpott, catch: Stop using wikimedia/composer-merge-plugin

Revert "Issue #2912387 by greg.1.anderson, Mixologic, Mile23, alexpott, catch: Stop using wikimedia/composer-merge-plugin"

This reverts commit 5cd26f24.

Issue #2912387 by greg.1.anderson, Mixologic, Mile23, alexpott, catch: Stop using wikimedia/composer-merge-plugin

Issue #3008870 by amateescu, kostyashupenko, mondrake, jibran, alexpott: Drop support for PHPUnit 4.8 once PHP 5 is no longer supported (8.8.x)

Issue #2867960 by Eric_A, Mile23, Jo Fitzgerald, mpdonadio: Merge Component composer.json files to account for them during build

Issue #2935137 by el7cosmos, Mixologic: License "GPL-2.0+" is a deprecated SPDX license identifier, use "GPL-2.0+-only" or "GPL-2.0+-or-later" instead

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

Issue #2886279 by dawehner, alexpott, drpal, zaporylie, Wim Leers, neclimdul, Mile23, Chi: Add PHPCS and PHPCBF as Composer scripts

This reverts commit 7c486399.

Issue #2851661 by alexpott, dawehner, xjm: Ensure that we're using the right ruleset for coding standards checking

Issue #2866109 by Eric_A: Add composer installer-paths for drupal-custom-modules/themes before 8.3.0

Issue #2758737 by Mixologic, amateescu, ndf, webflo, Mile23, bojanz: Add a packages.drupal.org to root composer.json

Issue #2744463 by Mile23, dawehner, pfrenssen, joelpittet, tstoeckler, alexpott, klausi: Add phpcs, coder 8.2.8 as --dev requirements for drupal/core