Did some cleanup on AbstractCommonEveApi::isEveApiXmlError()
Updated AbstractCommonEveApi::updateCachedUntil() to only require the XML and
 not EveApiReadInterface $data since it only needs the XML
Updated AbstractCommonEveApi::getXslName() to use $apiName and $sectionName
instead of $data
Dropped unused DatabasePreserverInterface
Marked EveApiDatabaseInterface with @api tags