Aiolifxc

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Changed
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* Add more log messages.
* Fix display of selected devices in sample app.
* Simplify API. Merge device classes into light classes.

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Changed
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* Update pip dependancies.
* Simplify start_discovery function.
* Update to Beta status.
* Fix API docs on readthedocs.

Fixed
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* Update MANIFEST.in file.

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Changed
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* Update mypy from 0.511 to 0.520

Fixed
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* Ensure we act on selected device in sample client.
* Fix mypy errors.
* Fix message size calculation.
* Add configurable grace period for unregister.

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Fixed
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* Fix failure to re-register a light that went off-line.

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Fixed
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* Fixed FD resource leak in discovery of existing lights.

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Changed
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* Significant changes. Improvements to the API. Type hints, doc strings, etc.