Blender Git Loki

Property Search: Move properties context buttons back to a panel

The context path "breadcrumbs" used to be in a panel in 2.79.
Although they look a bit better in the header, there isn't enough
space for them with the property search field in the header as well.

Maybe there will be another solution in the long term to fit both
the search field and this panel in the header, but for now, this
commit moves these labels back to a header-less panel.

Differential Revision: https://developer.blender.org/D8853