Rpi-backlight

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- Add Python 3.11 as supported version, drop 3.6
- Add support for Microsoft Surface RT (`54 <https://github.com/linusg/rpi-backlight/pull/54>`_, `apandada1 <https://github.com/apandada1>`_)

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- Add Python 3.10 as supported version
- Support alternate backlight sysfs path (`50 <https://github.com/linusg/rpi-backlight/pull/50>`_, `j-coopz <https://github.com/j-coopz>`_)

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- Fix board type detection

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- Drop support for Python 3.5, which reached end-of-life in late 2020. Supported versions as of this release are 3.6 - 3.9
- Implement automatic board type detection (`32 <https://github.com/linusg/rpi-backlight/pull/32>`_, `p1r473 <https://github.com/p1r473>`_),
passing a ``board_type`` to the constructor is no longer necessary in most cases, even when using an ASUS Tinker Board
- Fix setting brightness to max value and brightness fading loop condition (`35 <https://github.com/linusg/rpi-backlight/pull/35>`_, `Martin-HiPi <https://github.com/Martin-HiPi>`_)

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- Add support for ASUS Tinker Board 2 (`29 <https://github.com/linusg/rpi-backlight/pull/29>`_, `p1r473 <https://github.com/p1r473>`_)

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- Add toggle functionality to CLI (`21 <https://github.com/linusg/rpi-backlight/pull/21>`_, `p1r473 <https://github.com/p1r473>`_)
- Replace Travis CI with GitHub actions (`20 <https://github.com/linusg/rpi-backlight/pull/20>`_, `linusg <https://github.com/linusg>`_)
- Improve tests