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fa0a1b3cdd
This finishes off implementing values and source for all (current) classes in gpiozero. I'm afraid things get rather complex in this commit. For starters, we've now got quite a few "aggregate" classes which necessarily don't descend from GPIODevice. To implement values and source on these I could either repeat a helluva lot of code or ... turn to mixin classes. Yeah, it's multiple inheritance time, baby! Unfortunately multiple inheritance doesn't work with __slots__ but we really ought to keep functionality that they provide us (raise AttributeError when an unknown attribute is set). So I've implemented this with ... erm ... metaclasses. Sorry!