Bug fixes

The release includes a couple of minor bug fixes.
#3161956: No ID in render array for blocks
#3173946: drupal_region() overcaches empty

Variable not defined: https://www.drupal.org/project/viewsreference/issues/3030943

Provide URI formatter: https://www.drupal.org/project/file_download/issues/3068726
Incorrect DB table name: https://www.drupal.org/project/file_download/issues/3097358
Add file size: https://www.drupal.org/project/file_download/issues/3102513

Main changes:

- Better styles for the config/people page.
- Adjustment to block layout page
- Fix issues with ui-dialog and linkit fields.
- Fixed broken image path for icon.

This is the first release with Drupal 9 support.

Warning: This release drops support for Drush versions < 9. If you're still on Drush 8, say because you're using Aegir*, please open an issue to bring back support (and ideally provide a patch).

Changes since 8.x-1.16: