Handle ssh and telnet URL protocol/scheme

[spodskubka]

Windows apps can declare support for specific URL schemes, much like they can declare support for specific file name extensions.
It would be great if Remote Terminal could be used to open ssh://host:port or telnet://host:port URLs.

For the telnet scheme see https://tools.ietf.org/html/rfc4248.
For the ssh scheme see http://www.iana.org/assignments/uri-schemes/prov/ssh or https://tools.ietf.org/html/draft-ietf-secsh-scp-sftp-ssh-uri-04.