Grammar: Move RFC 3262 stuff to */rfc3261.pegjs
Grammar: Move RFC 3326 stuff to */rfc3261.pegjs
Grammar: Move RFC 3327 stuff to */rfc3261.pegjs
Grammar: Move RFC 3428 stuff to */rfc3261.pegjs
Grammar: Move RFC 3428 stuff to */rfc3261.pegjs

also fix some other URI-related rules
Grammar: Move RFC 2234 stuff to */rfc3261.pegjs
Grammar: Move RFC 5626 stuff to */rfc3261.pegjs
Grammar: Move RFC 5954 stuff to */rfc3261.pegjs
Grammar: Move RFC 7118 stuff to */rfc3261.pegjs