BREAKING: `State::Degraded` renamed to `State::DegradedReachable`
BREAKING: remove `UploadError::Timeout`
BREAKING: `Problem::DescriptorUpload` now wraps `Vec<DescUploadRetryError>`
REMOVED: `OnionServiceBuilder::anonymity`, `OnionServiceConfig::anonymity`, `OnionServiceConfigBuilder::anonymity`
REMOVED: `OnionService::new`