Minor tweaks to I/O client

I've always wanted the ability to just refresh one buddy without having to go to the Instant Outliner menu.

That's what the new Refresh button does. Put the cursor on the buddy you want to check, click the button, and we get the latest version of their outline from the server. The buddy's name emboldens, and when you collapse/expand you'll see the newest version. Note that there might not be any changes.

BTW, there was already a command in the right-click menu that does this.

The right-click menu in the buddy window was broken. It was getting part of the menu from the nodetype, and the other part from a callback. Changed it so the callback rules. This is done in io.init.

Parts