#8 OpenFile, SaveFile and FolderBrowse dialogs

[Pete Davis]

We need custom versions of all these dialogs. We need custom ones for several reasons:

1> We need to do custom rendering so that we can theme them.

2> We need to add extended support for folder browsing/favorites. Since folders will be heavily used in DesArt, we ought to make it very easy for users to find folders. Using a tree is fine sometimes, but we ought to keep track of favorite folders and make them easily located.