More efficiently update User Bounding Boxes

[fm3]

Currently each update action contains the whole list. We should probably use incremental updates instead, like with skeletons.

This will also interact with live collaboration, where we may have to redesign some update actions.

We may also want to consider lazily applying volume update actions on the proto (needs to be carefully considered though, has other effets) (That’s already done now with #7839 )

[MichaelBuessemeyer]

We may also want to consider lazily applying volume update actions on the proto (needs to be carefully considered though, has other effets)

I'd put this in another issue

[fm3]

lazily applying volume update actions

That’s actually done now with #7839

[MichaelBuessemeyer]

@knollengewaechs I started working on this a little in PR #8492. Could you please take over the frontend part?