[Net\Url] Conform to RFC 3986

[AnrDaemon]

It's desirable to write an [RFC 3986] conformant encoder/decoder for URI parts.

Specifically the query string part (it's known that PHP's parse_str mangles certain characters in parameter names).

[AnrDaemon]

Probably make such parser optional. May be.

[AnrDaemon]

Also the issue of repeated slashes inside the path needs to be looked at.

I.e. 'http://localhost/' + '/some/path' shouldn't end in 'http://localhost//some/path'. IMO. And per RFC.