Need icon for multiple files / documents for drag'n'drop

[jeremypw]

See https://github.com/elementary/files/issues/1000

There do not seem to be suitable icons to use to represent dragging multiple objects.

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[thomas-shirley]

An emblem over the icon being dragged, indicating the number of files selected would work. E.g:

[thomas-shirley]

Assuming of course there is a pipe to send the active selection count to the UI and update the text.