Deprecate getUrl, curlProxyServer and encourage usage of HTTPRequest
The SYS.curl* settings are being used by GeneralUtility::getUrl and openid. And probably other extensions are using that too.
Since 6.0 we have the nice HttpRequest adapter for the PEAR HTTP_Request2 component, which is a full replacement of what our old getUrl does.
So we want to deprecate getUrl along with the curl* settings.