Add multi-GPIO group support#256
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This updates `Circuits.GPIO.open/3` to support being passed a list of GPIOs. These GPIOs are then read or written together. GPIO values are numbers where the least significant bit is the first GPIO, then the next one, etc. This improves performance and removes inter-GPIO delays. All lines in a group must be on the same controller.
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This updates
Circuits.GPIO.open/3to support being passed a list ofGPIOs. These GPIOs are then read or written together. GPIO values are
numbers where the least significant bit is the first GPIO, then the next
one, etc. This improves performance and removes inter-GPIO delays. All
lines in a group must be on the same controller.