propagate ugc units to robot controller and Unity interface

Description

This has been tested in a unity game. See https://git.barrett.com/burt/games/burt-follow-me/merge_requests/17

What to focus on

• put content here.

Reviewers

• @cw
• @amyblank
• @bz
• @ps

Resources

Issues

What issues does this fix?

• Fixes #issue-number