Add support for the Lumencor Spectra III light engine

[carandraug]

This is a device that controls 8 laser channels and can be controlled via serial. We have it in our Aurox system. I have placed the technical documents in micronadmin.

This is similar to the Toptica iChrome multi-laser engine (issue #71) and also requires a controller ABC (discussed on issue #62). I am now doing it as part of implementing the Prior ProScan as two examples of devices that control multiple sub devices.

[carandraug]

Done with 6fe63cb