#100 File dialog based on VFS

[sky_HALud]

This feature request came based on the idea of Mario
Ivankovits (VFS lead developer) to provide a file
dialog that can be used to open/save files in VFS file
systems.

For doing this properly let's acumulate here thoughts
on this topic.

While this could very well be the first spin-off SWT
component from JCommander it will be certainly useful
when we will implement an internal editor (e.g. to have
an elegant way of editing an FTP/SFTP file without
downloading it).