DuneHD media player (#4588)

* Implement WAQI sensor

* Corrections based on CI check.

* Updated requirements_all.txt for pwaqi==1.2

* Require latest version of pwaqi

* Initial implementation of DuneHD media player component based on pdunehd.

* Major: avoid update() in property fetch,
Major: implement source support,
Major: single device per media player instance,
Major: support for volume / mute controls

* Pythonify pdunehd.
Support media_title.

* Fix pylint.

* Further pylint.

* docstring

* Formatting and indentation.

* Change indentation to spaces.

* Update coverage and recorded requirements before PR.

* Further pylint / fake8 / pydocstyle fixes.

* Implement next / prev track,
Properly decode blu-ray playback,
Attempt to decode media title

* Fix play / pause
Linting

* Update requirements.
Fix lint.

* Fix lint and syntax error

* Yet more linting.

* Yet more linting.

* Fix lint: line too long.

* Force update of HA state.