Issue #3299678 by mondrake, catch, longwave: Deprecate DiffEngine and replace with sebastian/diff

composer.lock

composer/Metapackage/CoreRecommended/composer.json

composer/Metapackage/PinnedDevDependencies/composer.json

core/composer.json

core/lib/Drupal/Component/Diff/Diff.php

core/lib/Drupal/Component/Diff/DiffOpOutputBuilder.php

core/lib/Drupal/Component/Diff/Engine/DiffEngine.php

core/lib/Drupal/Component/Diff/Engine/DiffOp.php

core/lib/Drupal/Component/Diff/Engine/DiffOpAdd.php

core/lib/Drupal/Component/Diff/Engine/DiffOpChange.php

core/lib/Drupal/Component/Diff/Engine/DiffOpCopy.php

core/lib/Drupal/Component/Diff/Engine/DiffOpDelete.php

core/lib/Drupal/Component/Diff/composer.json

core/misc/cspell/dictionary.txt

...s/Drupal/Tests/Component/Diff/DiffOpOutputBuilderTest.php

...sts/Drupal/Tests/Component/Diff/Engine/DiffEngineTest.php

core/tests/Drupal/Tests/Component/Diff/Engine/DiffOpTest.php