Better size calculation in advanced importer preview.
Uses the skeleton mesh to calculate the scene's bounding box.
This improves some situations where a mesh instances' scale
does not match its visual representation when a skeleton
is applied.
Advanced importer skeletal preview UX improvement.
Make the visibility of the skeletal preview in the advanced importer
when selecting an animation dependent on a new dedicated toggle button
rather than carrying over whether a skeletal node was or was not previously
selected before selecting the animation.
Advanced importer skeletal preview fix.
Fixes the preview on scaled skeletons in the advanced importer by applying the node's scale
to the preview and generating a skin for it.
6532eff7a7