[core] jHueFileChooser allowed to select a folder

I am using it with:

createFolder: true,
uploadFile: false

but would like to be able to only pick a directory. Could we add a new button 'Select folder' or something like this when we have a 'selectFolder: true'?

At the same time it could be nice to add a little separation between the files and the 'Create folder' button when we have createFolder: true.