- support light type when exporting virtools.
- both import and export virtools file now support light type. however there is a slight bug about light direction need to be resolved.
- fix bug that exporter throw exception if exported collection contain non-mesh object or exported object is not mesh object.
- fix the usage of BMMeshTrans according to upstream changes.
- 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.
