Mistake in rB459974896228: UI: hide object instancing panel for object types that dont support instancing.
To use Object Fonts, (vertex) instancing needs to be enabled.
So bring back the instancing panel and improve the instancing choice
(similar to rB6c0c766bcaa0) by just giving the 'Vertex' choice (or
'None') and explain this is only used for Object Fonts on characters.
Was reported in D11348 itself.