Playerdo

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* Fixed broken packaging
* Switched to uv/pyproject.toml for managing dependencies and recommended installing.

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* Dropped support for Python < 3.8
* Dropped support for MPRIS 1
* Reorganised structure into more standard layout, including using console_scripts entry point
* Dropped ``help`` command in favour of ``--help``
* Overhauled the way active/inactive/broken backends/players are shown in help
* Added ``-p`` / ``--player`` option for selecting the player.

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* Dropped Python 2 support
* Fixed some Python 3 issues

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* Support for pianobar
* Support for MPD.
* Better support for Cinnamon
* Fixed support for cmus

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* New 'install_cinnamon' command to properly support Cinnamon 2.0 and higher.
* Fixed some Python 3 compatibility issues, dropped support for Python < 2.7

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* new command 'is_playing'.
* shell-fm support now requires version 0.8