Add Support for Export to Visio

I'd like to have support for exporting to Visio from Mindjet. Basically, sometimes I want the flexibility of sharing via Visio, whilst doing the bulk of my creation and editing via MindJet/MindManager. This used to be supported by Mindjet, so I'd like to see it come back.

I don't like the double-hop of having to export to PowerPoint then copy/paste to Visio.