Build 24921668

New: Head tracker assignment

If you have a tracker mounted on your headset - the kind a space

alignment tool reads as its reference - you can now mark it as Head.

A tracker marked this way is left visible instead of being hidden, so

the tool it belongs to keeps working. It can be unassigned again at

any time.

What we believe is fixed:

- Virtual trackers ending up far from their real trackers when a space

alignment tool is in use. This should now correct itself, but it has

only been confirmed on our own setup so far.

- Controller buttons and thumbsticks not responding. The virtual

trackers now report the same SteamVR controller type that other

tracker drivers use, which we believe was the cause. We have not been

able to reproduce the original problem here, so we cannot confirm it.

Both of these are fixes we expect to work rather than ones we have seen

work in the situation they were reported from. If you were affected by

either, we would like to know whether this build helps - and equally, if

something that used to work no longer does.

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