Location of transform visualization controls is unintuitive

[jleibs]

Describe the bug
Based on #2577
I was expecting to be able to turn on transform visualization in the api transform_3d demo.

To Reproduce

python tests/python/test_api/main.py --test transforms_rigid_3d

Expected behavior
Expect to find an entity property to enable / disable visualization of the transforms, but no such option exists.

[Wumpf]

They are apparently just not where you expect them?

[Wumpf]

we don't inheritance/global options on this one yet, that's probably what we're missing? I'm a bit worried our systems aren't up for the task there yet - we already have the problem that disabling interactivity on a group correctly propagates but still shows as "enabled" on all children (on an individual basis they are!)

[jleibs]

You are correct, I was totally looking in the object groups because those "feel" like transform hierarchy levels, but aren't.

[Wumpf]

This is one of the many problems related to how we do grouping. We need to rethink that in general which is a different issue than just any particularities on transform controls.