Inspired by sfackler/rust-postgres-macros which is a compile time SQL parser

There are ton of instances in servo, where we do something like Url::parse("http://mozilla.com").unwrap(). It'd be great if we could do that validation at compile time with a macro (e.g. url!("http://mozilla.com")).

I have no idea how feasible this is, just throwing around the idea.