cba447966e
Do not instance linked object immediately in scene, this was never a good idea and is doomed to fail nowadays, with complex relations between objects, collections and scenes. Instead, this commit refactors a bit linking code to add loose objects to current scene *after* everything has been imported, and ID pointers have been properly remapped to new ones - i.e. once new linked data is supposed to be fully valid, just like we were already doing with collections. As a bonus, it means we do not have to pass around scene, view3d etc. to `BLO_library_link_named_part_ex()` and co.