Issue #2721309 by spokje, quietone, shalini_jha, anoopjohn, smustgrave: Fix Drupal.Commenting.FunctionComment.ParamCommentFullStop

Issue #2909372 by zaporylie, quietone, osman, mfernea, shkiper, martin107, xjm, andriyun, alexpott, daffie, spokje, borisson_, smustgrave, longwave, ioana apetri, kul.pratap, larowlan: Enable 'Drupal.Commenting.VariableComment.MissingVar' coding standard

Issue #3444020 by andypost, smustgrave: [8.4] Fix implicitly nullable type declarations in composer plugin

Issue #3328454 by xjm, Bhanu951, jidrone, smustgrave: Replace most strpos() !== FALSE or === FALSE with str_contains()

Issue #3088730 by Spokje, anmolgoyal74, ankithashetty, Mile23, longwave, naresh_bavaskar, greg.1.anderson, Mixologic, klausi: Include 'composer' directory in phpcs scans

Issue #3103090 by greg.1.anderson, alexpott, jungle, ravi.shankar, dww, Mile23, larowlan: Avoid re-scaffolding unchanged files (and printing scaffold file information over and over)

Issue #3103918 by greg.1.anderson, Mile23, alexpott, Mixologic, catch: [policy + patch] Decide on backwards compatibility policy for Composer plugins in Drupal 8

Issue #3085697 by greg.1.anderson, Mixologic, mbaynton, larowlan: Allow scaffold plugin to append to non-scaffolded files

Revert "Issue #3085697 by greg.1.anderson, mbaynton, Mixologic, larowlan: Allow scaffold plugin to append to non-scaffolded files"

This reverts commit c5ac07aa.

Issue #3085697 by greg.1.anderson, mbaynton, Mixologic, larowlan: Allow scaffold plugin to append to non-scaffolded files

Issue #2982684 by greg.1.anderson, Mile23, Mixologic, webflo, alexpott, yogeshmpawar, pingwin4eg, vijaycs85, larowlan, dww, borisson_, phenaproxima, kim.pepper, bojanz, grasmash, hctom, kmbremner, pingers, Jax, sherakama, derhasi, claudiu.cristea, jhedstrom, Xano, Grimreaper: Add a composer scaffolding plugin to core