Issue #3172194: Move the logic to a real purger for...
Issue #3172194: Move the logic to a real purger for varnish_image_purge and remove varnish_focal_point
Make that Varnish Image Purge uses Purge framework, in the current version everything is happening in a hook_entity_update. With this change from the hook_entity_update will trigger a real purger.
Remove (almost) varnish_focal_point_purge since it's not needed with the new varnish_image_purge version because now we are purging all image styles that exist in the file system.