BiFrost rig autoupdate should be able to drive attributes

[jacob_levinson]

For whatever reason, Autoupdate can't be changed to be driven by another control, which is fine. But it seems because of that it's also unable to allow that attribute to drive other attributes. It would be really helpful to have certain things only visible when I have a version of the rig that is dynamic and evolving so I could basically have features that are built solely for modifying the rig and then when I turn Autoupdate off, they simply go away