rebocap support

[moondigi]

https://doc.rebocap.com/en_US/SDK/

Rebocap seems to be emulated as a Vive Tracker in SteamVR, but it isn't recognized in Custom Avatars; it keeps showing "Tracker not found," even though I've already assigned a role.

[nicoco007]

This is likely a similar issue to #188. Try following the VMT instructions except instead of vmt you should have something for Rebocap trackers in the controllers list. I would suggest bringing this up with the Rebocap team because this is likely a setup issue on their end.