Added support for HTC Vive trackers.#16

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matzman666 wants to merge 5 commits intoarduino-libraries:masterfrom

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Commits on Apr 6, 2017

Commits on Apr 8, 2017

Gave credits to Peter S. Hollander for finding out the correct format of
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Commits on Nov 26, 2017

Refractored how usb message fields are handled.
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