mathieui 13de36baa1 XEP-0030: API changes
- ``supports``, ``has_identity``, ``get_info``, ``get_items`` are now coroutines
- ``set_info````set_items``, ``del_items``, ``add_item``, ``add_identity``,
  ``del_identity``, ``set_identities``, ``del_identities``, ``add_feature``,
  ``del_feature``, ``set_feature``, ``set_features``, ``del_features``
  now return a Future

also fix has_identity and supports which have been broken in forever
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..
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