Cleanup clipboard D-Bus API

- The clipboard now determines each objects unique id and
    returns it from add_object()
- The ID is opaque to the client and should not be used/accessed
    other than with the clipboard service
- Add object type hints for dbus-python
- Sugar clipboard bindings for get_object() now return a dict rather
    than a tuple
- ClipboardIcon now retrieves the real file path and uses that
    to open the file
- Adapt sugar bits to clipboard changes

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