Picozero

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+ Introduced ``pinout()``
+ Bug fix with ``DigitalInputDevice.when_deactivated`` decorator
+ Documentation tidy up and minor fixes

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+ Introduced ``Servo`` class
+ Documentation fixes

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+ Introduced ``Motor``, ``Robot``, and ``DistanceSensor`` classes.
+ Renamed ``LED`` factory ``use_pwm`` parameter to ``pwm`` to match other classes. **Note:** This is an API breaking change.
+ Resolved issue with ``RGBLED`` when not using ``pwm``.
+ Resolved issue where ``blink`` / ``pulse`` rates of ``0`` raised a traceback error.
+ Other minor bug fixes.
+ Documentation updates.

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+ Pico W compatibility fix for onboard LED.

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+ Minor fixes for bugs found during testing.
+ Small improvements to exception messages.
+ Added close methods to Speaker and PWMOutputDevice.
+ Added unit tests.
+ Added RGBLED.colour as an alias to RGBLED.color.

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+ Beta release.
+ Documentation updates.
+ Minor bug fixes and refactoring.