libwebsockets

ss: allow url style endpoint addresses

The endpoint field in streamtype policy may continue to just be the
hostname, like "warmcat.com".

But it's also possible now to be a url-formatted string, like, eg,
"https://warmcat.com:444/mailman/listinfo"

If so (ie, if it contains a : ) then the decoded elements may override
if tls is enabled, the endpoint address, the port, and the url path.

No ABI change.