Sentai Digital

> Is there any reason this can't be done in contrib? Bootstrap. We have to be able to load a module to load the configuration that we don't know is...

Adding `$settings['config_backends']` is a big enough change to warrant its own issue.

A contrib module will eventually need a way to tell `install.php` that `ConfigDatabaseStorage` is available as a backend, before any modules are initialized, even core modules like system or user....

Along with auto-refresh (IMAP IDLE) support.