Andrews Big Dialog Re-Design/OCAL

Changes

 * UI Redesign (which includes)
    - Altered the padding and packing of all widgets
    - Added search entry with clear and search icons
    - Added OCAL Logo overlay
    - Put descriptions inline in list
    - New preview widget that shows extra metadata
    - New status widget to notify on errors/success etc.
    - Dialog is now persistent (retains state)
    - Better messages for the user
    - Changed title/menuitem to 'Import Clip Art'

 * Backend stuff (which includes)
    - Use new GFile API instead of depreciated GNOMEVFS
    - Use async methods so the UI isn't blocked
    - Use smaller, thumbnail images in the preview widget (save on bandwidth and increase speed)
    - Implement cancelling of operations
    - Put downloaded resources into one directory, from which we can use later
    - Big cleanup in terms of code

Screenshots

Mockups