Keep ContactItem like HostItem database

At the moment we have a couple of plugins implementing their own HostItem class, it would be something special if they could share their information in the same way that plugins that interact with contacts do. Sysadmins often connect to the same machine in a variety of ways depending on the job that needs done, ssh, vnc, NX, telnet, etc, what if you could arrow into a host and see all of the ways of connecting, just like a contact, where you can see all of the ways of _connecting_ with that person.