When copying an image from e.g. Firefox or Chromium the clipboard
will contain both the image itself, and the url of the image --
presumably it makes more sense to store the image data itself if
it is available -- the order of the items in the *_FREE_AREA_Copy
defines the order of preference for which data in the clipboard
should be used.

Change-Id: Id8b862a9f2fce3a34adbb16509e9b7372500a239
Reviewed-on: https://gerrit.libreoffice.org/7928Tested-by: Caolán McNamara <caolanm@redhat.com>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>