Add support for uDMX devices

[unfa]

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uDMX is a design of a tiny, USB-powered DMX interface. QLC+ supports these, and the drivers are in the Linux kernel. The design is open and it's easy to buy cheap devices based on it (even if they don't come with a copy of the GNU GPL license as they should...).

As I've gotten one myself as a "baby's first DMX interface" I'd love to be able to drive it directly from Ossia Score, without needing to use QLC+ as a middle-man.

More information: https://docs.qlcplus.org/v4/plugins/udmx https://www.anyma.ch/research/udmx/