Blender Git Loki

Depsgraph: Synchronize selection from original scene to copied-on-write one

This makes it possible to select objects in the viewport.

Selection in edit mode is still tricky, mainly because currently such update
would require tagging batch as updated, which is not possible with using just
and original object because it will never have batch.

Possible solution here would be to introduce some "batch" or "render" component
to depsgraph ID node for objects, so we can tag batch for update via depsgraph
tagging API.