- fix issue that blender 4.2 lost use_auto_smooth and calc_split_normals. (it almost works but not perfect. still need more debugging)
- remove depracted material blend_mode. use modern one instead. (the modern setting make me consufes but it works)
- update apply_virtools_material. use keywords, not index to visit input and output sockets.
- update blender mesh operator. send a message when mesh::validate() proceed mesh and stop custom normals assignment.