<AWT Dev> First patch for 6927978 (Directory Selection standard dialog support)

[Costantino Cerbo]

Hi Anthony, Hi Damjan,

this is a first patch for the bug 6927978 (Directory Selection
standard dialog support). Currently it supports only GTK.

Regarding the XDirectoryDialogPeer (X-Windows) I don't know how the
original looks like.
My idea was to modify the XFileDialogPeer removing the columns on the
right (files) and leaving the one on the left (directories).
Also the files for the filter have to disappear. Do you agree?
Otherwise could you explain me how is the native X-Windows
DirectoryDialog?

@Damjan: The patch contains also something for the Windows peer (see
MTookit#createDirectoryDialog).

As usually any feedback is welcome!

Cheers,
Costantino
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