public ProxyConfig build() {
            return new ProxyConfig(
                    haltBootOnConfigValidationFailure,
                    proxyId,
                    contentDir,
                    pathConfig,
                    receiveDataConfig,
                    eventStoreConfig,
                    aggregatorConfig,
                    forwardFileDestinations,
                    forwardHttpDestinations,
                    logStreamConfig,
                    contentSyncConfig,
                    feedStatusConfig,
                    threadConfig,
                    proxySecurityConfig,
                    sqsConnectors);
        }
Builds a {@link PropertyPath} by merging parts onto the root {@link PropertyPath}
stroom-proxy/stroom-proxy-app/src/main/java/stroom/proxy/app/ProxyConfig.java