Added new XEP-0050 implementation.

Backward incompatibility alert!

Please see examples/adhoc_provider.py for how to use the new
plugin implementation, or the test examples in the files
tests/test_stream_xep_0050.py and tests/test_stanza_xep_0050.py.

Major changes:
    - May now have zero-step commands. Useful if a command is
      intended to be a dynamic status report that doesn't
      require any user input.
    - May use payloads other than data forms, such as a
      completely custom stanza type.
    - May include multiple payload items, such as multiple
      data forms, or a form and a custom stanza type.
    - Includes a command user API for calling adhoc commands
      on remote agents and managing the workflow.
    - Added support for note elements.

Todo:
    - Add prev action support.

You may use register_plugin('old_0050') to continue using the
previous XEP-0050 implementation.

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