Bug fixes

Fixed PHP warning when enabling modules with dependencies.

Issue #3137624 by extralooping: Allow replacing individual keys
Issue #3120756 by Suresh Prabhu Parkala: file_scan_directory() is deprecated and drupal 9 compatibility
Issue #3128240 by amateescu: Don't try to rewrite config if the site is being installed from existing configuration
Issue #3099765 ignore the /vendor dir
Issue #3099765 adds composer.json file
Issue #3099765 adding PHP minimum version specification to the info file

Fixed coding standards and other minor issues.

In this release,

-> Minor bugs has been fixed.
-> Applied coding standards.

Release candidate 2 for Views Flexbox.

This version correctly declares Drupal 9 version compatibility. See #3138484: Use the double pipe logical OR operator (||) in info.yml file for core_version_requirement key..

Issue #3133168 by jurgenhaas: Error: Call to undefined method Drupal\Core\Field\FieldItemList::isSqrlOnly()