The "Configuration Files" module doesn't declare its dependency from the "Config Tools" module but it uses its configuration object

The Configuration Tools module cannot simply be added as dependency for the Configuration Files module, or users who just installed that module (which was possible, since the Configuration Files module didn't declare its dependency from the Configuration Tools module) would get an error message about an installed module that requires another module.

The Configuration Tools module needs to be installed in a post-update hook, and uninstalling it should not be allowed from an uninstallation validation service.