Create a simple wrapper/factory for "servo hats" #177
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Wraps the PCA9685 controller so that servos don't get re-used accidentally. Additionally, sets up a default singleton, also to avoid collisions.
If a servo is initialized with the _default_ initial setting, there's a large likelyhood that it will "jump" to that position, thereby stressing the physical mechanism. Setting this is **intended** to prevent this, but not 100% guaranteed.
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Wraps the PCA9685 controller so that servos don't get re-used accidentally. Additionally, sets up a default singleton, also to avoid collisions.