Option to Override Mesh Name with Node Name when Importing for Compatibility

[effs]

To support older files without modders having to fix their mesh naming in Blender, new import option that forces using the node name (object name in Blender) instead of the actual mesh name.

There's a warning printed if the names don't match either way.

The problem as seen in Blender (modder has only changed the top-level object name, which doesn't automatically change the mesh data block name, resulting in the alphabetical submesh order probably being broken)

Breaking

• Error if a mesh is referenced by multiple nodes, unless someone comes up with a valid use case (in which case the entire import logic needs to be reviewed.)

closes #1519

[seberoth]

lgtm